Displacement flow diffusers - TROX

1/10/US/3
Displacement flow
diffusers
TROX USA, Inc.
4305 Settingdown Circle
Cumming, Georgia 30028
USA
Telephone 770-569-1433
Facsimile 770-569-1435
www.troxusa.com
e-mail: sales@troxusa.com

Application - Construction - Performance Notes
Application
TROX displacement flow diffusers have been developed
specially for air supply in displacement flow ventilation
systems. A wide range of different shapes ensures that they can
be effectively integrated into the interior design. They are maintenance-free
because they do not use filter material.
TROX displacement flow diffusers are used where good
ventilation efficiency is very important, i.e. the lowest possible
pollutant contamination in combination with optimum thermal
comfort in occupied spaces and work areas.
Construction
TROX displacement flow diffusers in standard construction are
made of galvanized sheet steel. The face plate is perforated with
3 mm holes. All visible areas are painted white but other colors
are available upon request. Customized
versions are available. Size tolerances ± 2.5 mm.
TROX displacement flow diffusers are supplied ready to install.
The special nozzles with integral air deflector scoops are
constructed of UL 94-rated plastic.
Model QL-WH-RO
TROX X30 and X60 nozzles utilized in all of the products
in this leaflet provide optimal flow equalization across
the diffuser face by extracting and turning the supply air flow
perpendicular to the diffuser face. Designs which
incorporate only a distribution plate often provide
inadequate flow equalization which results in larger
adjacent zones and reduced space utilization.
K SP
A EFF
1 2 3 5
L 0.2
12 x 18 x 12
654 3.15

Contents
ød
a
B-35 | H-35
b
Page 4
B-35 / H-35
B
T
Type QL-WE-E/
½ B
Page 6
T
1500 h
ød
H h
H
Δh
2000
a
B
Page 21
ød
Type QL-WV-RO/.../K
B
Page 22
a
Type QL-WE-RO/
½ B ½ B
T
Type QL-WS-RO/.../K
T
T
a
½ B
ød
B
D
a
B-35 / H-35
Page 8
Type QL-WE-O/
B
b
Page 10
Type QL-WF-E/
B + 2
Page 12
B + 2
½B
T
T
Type QL-WF-RO/
Page 14
Type QL-WR-RO/
Page 16
a
Type QL-WH-RO/
ød
B
b
ød
B
H h
ød
b
B
H h
B
H h
H h
H h
B
H h
ød
B
d
a
T
B
Page 24
Type QL-WFM...
b
B
½ B
Page 30
Page 32
Type QL-WQT-RO-2/
Type QL-WQT-RO-3/
B
Type QL-WQT-RO-4/
½B
B
T
Type
B
QL-WFT-RO/
b
Type QL-WFT-E/
d
a
T
B
½B
...-E/
...-E-2L/
...-E-3/
...-E-2R/
T
B
B
½B
Page 18
ød
Type QL-WV-RO/
Page 20
a
Type QL-WH-RO/.../K
IMPORTANT:
This leaflet lists only the most common standard sizes.
Other dimensions are available on request.
B
B
½B
B
Technical information...............................................................34
Displacement chilled beams....................................................36
Temperature relationships - Nomenclature..............................37
Design nomograph - Supply air determination.........................38
Design examples.....................................................................39
Mounting details......................................................................40
Flow rate control options..........................................................41
Specification text.................................................................... 42
Order details............................................................................44
3

Dimensional Information
Type QL-WE-E
Displacement terminal for flush mounting within a framed wall
Rectangular inlet connection
Single direction airflow discharge pattern
a + 1
a
D
b
H
QL-WE-E chart.ai
W
Product Features
• Designed for flush mounting in a framed wall
(3 3 /4”cavity)
• Face is removable, no visible fasteners
• Rectangular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Plenum box galvanized steel
• Perforated face is 20% free area
• All visible surfaces powder coat white
Units listed below are standard sizes, other sizes available upon request.
Listed Size
CFM Rangeª
Nominal Size
Inlet
W x H x D NC = 25 NC = 30 W H D
b x a
15 x 16 x 3 3 /4 80 90 15 16 3 3 /4 12 x 2 1 /4
15 x 18 x 3 3 /4 95 105 15 18 3 3 /4 12 x 2 1 /4
15 x 24 x 3 3 /4 130 155 15 24 3 3 /4 12 x 2 1 /4
15 x 30 x 3 3 /4 145 170 15 30 3 3 /4 12 x 2 1 /4
15 x 36 x 3 3 /4 150 180 15 36 3 3 /4 12 x 2 1 /4
23 x 24 x 3 3 /4 215 250 23 24 3 3 /4 20 x 2 1 /4
23 x 30 x 3 3 /4 240 285 23 30 3 3 /4 20 x 2 1 /4
23 x 36 x 3 3 /4 260 300 23 36 3 3 /4 20 x 2 1 /4
23 x 42 x 3 3 /4 260 305 23 42 3 3 /4 20 x 2 1 /4
31 x 24 x 3 3 /4 305 360 31 24 3 3 /4 26 x 2 1 /4
31 x 30 x 3 3 /4 350 410 31 30 3 3 /4 28 x 2 1 /4
31 x 36 x 3 3 /4 365 430 31 36 3 3 /4 28 x 2 1 /4
31 x 42 x 3 3 /4 370 435 31 42 3 3 /4 28 x 2 1 /4
46 x 24 x 3 3 /4 495 580 46 24 3 3 /4 42 x 2 1 /4
46 x 30 x 3 3 /4 535 630 46 30 3 3 /4 42 x 2 1 /4
46 x 36 x 3 3 /4 555 650 46 36 3 3 /4 42 x 2 1 /4
Actual inlet dimensions b and a are 1/8" less then nominal values stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
4

Technical Data
Type Model QL-WE-E
K SP
A EFF
15 x 16 x 3
15 x 18 x 3
15 x 24 x 3
15 x 30 x 3
15 x 36 x 3
2 3
5

Dimensional Information
Type QL-WE-RO
Displacement terminal for flush mounting within sidewall
Round inlet connection
Single direction airflow discharge pattern
D
d
H
Model QL - WE - RO
W
Product Features
• Designed for flush mounting in a sidewall
• Face is removable, no visible fasteners
• Circular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Plenum box galvanized steel
• Perforated face is 20% free area
• All visible surfaces powder coat white
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
CFM Range a
Nominal Size Inlet
W x H x D
V 0 = 20 FPM V 0 = 60 FPM W H D
d
15 x 16 x 7 75 90 15 16 7 5 *
15 x 18 x 7 85 100 15 18 7 5 *
15 x 24 x 8 130 150 15 24 8 6 *
15 x 30 x 10 175 195 15 30 10 8 *
15 x 36 x 10 215 245 15 36 10 8 *
23 x 24 x 10 215 250 23 24 10 8 *
23 x 30 x 10 235 275 23 30 10 8 *
23 x 36 x 12 340 390 23 36 12 10 *
23 x 42 x 12 375 440 23 42 12 10 *
31 x 24 x 12 320 375 31 24 12 10 *
31 x 30 x 12 355 420 31 30 12 10 *
31 x 36 x 14 495 580 31 36 14 12
31 x 42 x 14 540 635 31 42 14 12
46 x 24 x 12 345 405 46 24 12 10 *
46 x 30 x 14 510 595 46 30 14 12
46 x 36 x 14 520 610 46 36 14 12
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
6

Technical Data
Model QL-WE-RO
Type QL-WE-RO
15 x 16 x 7
15 x 18 x 7
15 x 24 x 8
15 x 30 x 10
15 x 36 x 10
2 3 5

Dimensional Information
Type QL-WE-O
Displacement terminal for flush mounting in a framed wall
Plenum by others
Single direction airflow discharge pattern
D
1
H
W
Product Features
• Designed for flush mounting in a framed wall
• Face is removable, no visible fasteners
• Plenum is by others
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Units listed below are standard sizes, other sizes available upon request.
Listed Size
W x H x D
CFM Rangeª
Nominal Size
NC = 25 NC = 30 W H D
15 x 16 x 3 3 /4 70 80 15 16 2 1 /4
15 x 18 x 3 3 /4 85 100 15 18 2 1 /4
15 x 24 x 3 3 /4 125 145 15 24 2 1 /4
15 x 30 x 3 3 /4 150 175 15 30 2 1 /4
15 x 36 x 3 3 /4 190 225 15 36 2 1 /4
23 x 24 x 3 3 /4 195 230 23 24 2 1 /4
23 x 30 x 3 3 /4 240 280 23 30 2 1 /4
23 x 36 x 3 3 /4 305 360 23 36 2 1 /4
23 x 42 x 3 3 /4 360 425 23 42 2 1 /4
31 x 24 x 3 3 /4 295 345 31 24 2 1 /4
31 x 30 x 3 3 /4 360 420 31 30 2 1 /4
31 x 36 x 3 3 /4 455 535 31 36 2 1 /4
31 x 42 x 3 3 /4 540 635 31 42 2 1 /4
46 x 24 x 3 3 /4 465 545 46 24 2 1 /4
46 x 30 x 3 3 /4 565 665 46 30 2 1 /4
46 x 36 x 3 3 /4 720 845 46 36 2 1 /4
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
8

Technical Data
Model QL-WE-O
Type QL-WE-O
15 x 16 x 3
15 x 18 x 3
15 x 24 x 3
15 x 30 x 3
15 x 36 x 3
2 3 5

Dimensional Information
Type QL-WF-E/
Displacement terminal for mounting adjacent to sidewall
Rectangular inlet connection
Single direction airflow discharge pattern
a + 1
a
D
b
H
W
Product Features
• Designed for mounting to a sidewall
• Face is removable, no visible fasteners
• Rectangular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Location
• Mounting base (optional)
• Duct cover (optional)
Units listed below are standard sizes, other sizes available upon request.
Listed Size
CFM Rangeª
Nominal Size Inlet
W x H x D
NC = 25 NC = 30 W H D
b x a
18 x 24 x 6 170 195 18 24 6 14 x 4
18 x 30 x 6 210 235 18 30 6 14 x 4
18 x 36 x 6 260 295 18 36 6 14 x 4
18 x 48 x 8 355 405 18 48 8 14 x 6
18 x 60 x 8 440 512 18 60 8 14 x 6
24 x 30 x 8 310 350 24 30 8 14 x 6
24 x 36 x 8 380 440 24 36 8 14 x 6
24 x 48 x 8 485 565 24 48 8 16 x 6
24 x 60 x 8 525 615 24 60 8 16 x 6
30 x 30 x 8 365 425 30 30 8 14 x 6
30 x 36 x 8 415 490 30 36 8 14 x 6
30 x 48 x 8 655 770 30 48 8 20 x 6
30 x 60 x 8 685 800 30 60 8 20 x 6
36 x 36 x 8 610 690 36 36 8 24 x 6
36 x 48 x 8 780 920 36 48 8 24 x 6
36 x 60 x 8 820 960 36 60 8 24 x 6
Actual inlet dimensions b and a are 1/8" less then nominal values stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
10

Technical Data
Model QL-WF-E
Type QL-WF-E/
18 x 24 x 6
18 x 30 x 6
18 x 36 x 6
18 x 48 x 8
18 x 60 x 8
2 4 6

Dimensional Information
Type QL-WF-RO/
Displacement terminal for mounting to sidewall
Round inlet connection
One way airflow discharge pattern
D
d
H
W
Product Features
• Designed for mounting to a sidewall
• Face removable, no visible fasteners
• One way discharge pattern
• Round inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• Additional sizes available upon request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Location
• Mounting base (optional)
• Duct cover (optional, specify ceiling height)
Units listed below are standard sizes, other sizes available upon request.
Listed Size
CFM Rangeª
Nominal Size
Inlet
W x H x D NC = 25 NC = 30 W H D
φd
18 x 24 x 10 170 195 18 24 10 8 *
18 x 30 x 10 205 235 18 30 10 8 *
18 x 36 x 10 240 280 18 36 10 8 *
18 x 48 x 12 350 400 18 48 12 10 *
18 x 60 x 12 410 480 18 60 12 10 *
24 x 30 x 12 305 350 24 30 12 10 *
24 x 36 x 12 360 425 24 36 12 10 *
24 x 48 x 12 395 465 24 48 12 12 *
24 x 60 x 14 560 655 24 60 14 10 *
30 x 30 x 12 345 405 30 30 12 10 *
30 x 36 x 14 470 540 30 36 14 12
30 x 48 x 14 570 670 30 48 14 12
30 x 60 x 16 785 920 30 60 16 14
36 x 36 x 14 525 615 36 36 14 12
36 x 48 x 16 755 885 36 48 16 14
36 x 60 x 16 780 915 36 60 16 14
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
12

Technical Data
Model QL-WF-RO
Type QL-WF-RO/
18 x 24 x 10
18 x 30 x 10
18 x 36 x 10
18 x 48 x 12
18 x 60 x 12
2 4 6 8

Dimensional Information
Type QL-WR-RO/
Displacement terminal for free standing mounting
Round inlet connection
360° airflow discharge pattern d
H
D
Product Features
• Designed for free standing mounting
• Circular inlet sized for maximum performance
• Top or bottom inlet location
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Location
• Mounting base (optional)
• Duct cover (optional, 2 pc. specify ceiling height)
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
D x H
CFM Rangeª
Nominal Size
NC = 25 NC = 30 D H d
12 x 18 205 235 12 18 8 *
14 x 18 265 300 14 18 10 *
14 x 24 380 440 14 24 10 *
14 x 30 425 500 14 30 10 *
16 x 24 475 540 16 24 12
16 x 30 560 650 16 30 12
16 x 36 640 750 16 36 12
18 x 30 680 775 18 30 14
18 x 36 820 960 18 36 14
18 x 48 930 1190 18 48 14
20 x 36 980 1130 20 36 16
20 x 48 1180 1385 20 48 16
20 x 60 1230 1440 20 60 16
24 x 36 1270 1435 24 36 20
24 x 48 1700 1985 24 48 20
24 x 60 1890 2220 24 60 20
* Optional VFL flow limiter (see page 41) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
14

Technical Data
Model QL-WR-RO
Type QL-WR-RO/
12 x 18 x 8
14 x 18 x 10
14 x 24 x 10
14 x 30 x 10
1 2 3

Dimensional Information
Type QL-WH-RO/
Displacement terminal for mounting adjacent to sidewall
Round inlet connection
180º airflow discharge pattern
C
D
W
d
H
Product Features
• Designed for flush mounting to a sidewall
• 180º discharge pattern
• Round inlet sized for maximum performance
• Directional nozzles provide even airflow across
face
• No filter or fabric media requiring periodic
changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Accesories
• Mounting base (optional)
• Duct cover (optional, specify ceiling height)
Units listed below are standard sizes, other sizes available upon request.
Listed Size
CFM Rangeª
Nominal Size
C Inlet
W x H x D
NC = 25 NC = 30 W H D φd
12 x 18 x 12 190 215 12 18 12 5 8 *
12 x 24 x 12 245 285 12 24 12 5 8 *
12 x 36 x 12 315 365 12 36 12 6 8 *
12 x 48 x 12 320 375 12 48 12 6 8 *
18 x 18 x 18 305 340 18 18 18 6 10 *
18 x 24 x 18 390 450 18 24 18 6 10 *
18 x 30 x 18 475 555 18 30 18 6 10 *
18 x 36 x 18 620 720 18 36 18 7 12
18 x 48 x 18 870 1020 18 48 18 8 14
24 x 36 x 20 775 875 24 36 20 9 16
24 x 48 x 20 1105 1290 24 48 20 9 16
24 x 60 x 20 1255 1475 24 60 20 9 16
30 x 30 x 28 955 1085 30 30 28 9 16
30 x 36 x 28 1085 1265 30 36 28 9 16
30 x 48 x 28 1270 1490 30 48 28 9 16
30 x 60 x 28 1950 2235 30 60 28 11 20
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
16

Technical Data
Type Model QL-WH-RO/ QL-WH-RO
12 x 18 x 12
12 x 24 x 12
12 x 36 x 12
12 x 48 x 12
1 2 3 5

Dimensional Information
Type QL-WV-RO/
Displacement terminal for mounting in a corner
Round inlet connection
90º airflow discharge pattern
W
C
C
W
d
H
Product Features
• Designed for mounting in a corner
• 90º discharge pattern
• Round inlet sized for maximum performance
• Directional nozzles provide even airflow across
face
• No filter or fabric media requiring periodic
changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Accesories
• Mounting base (optional)
• Duct cover (optional)
Units listed below are standard sizes, other sizes available upon request.
Listed Size
CFM Rangeª Nominal Size
C Inlet
W x H
NC = 25 NC = 30 W H φd
12 x 18 155 175 12 18 5 8 *
12 x 24 200 225 12 24 5 8 *
12 x 30 250 290 12 30 5 8 *
12 x 36 270 315 12 36 5 8 *
12 x 42 285 335 12 42 5 8 *
18 x 21 245 285 18 21 5 8 *
18 x 24 255 295 18 24 5 8 *
18 x 30 385 450 18 30 6 10 *
18 x 36 410 485 18 36 6 10 *
18 x 48 635 745 18 48 7 12
18 x 60 670 770 18 60 7 12
24 x 27 520 610 24 27 7 12
24 x 30 550 645 24 30 7 12
24 x 36 585 685 24 36 7 12
24 x 48 990 1150 24 48 9 16
24 x 60 1090 1280 24 60 9 16
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
18

Technical Data
Model QL-WV-RO
Type QL-WV-RO/
12 x 18
12 x 24
12 x 30
12 x 36
12 x 42
1 3 4 5

Dimensional Information
Type QL-WH-RO/.../K
Displacement terminal with duct cover for sidewall mounting
Round inlet connection
180º airflow discharge pattern
W
C
D
d
78"
59"
H
Product Features
• Designed for mounting to a sidewall,
180º discharge
• Round (top) inlet sized for maximum performance
• Integral cover extends to 78 inches in height
• Directional nozzles provide even airflow
across face
• No filter or fabric media requiring periodic
changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Mounting Accessories
• Mounting base (optional)
Performance • Extended duct cover Data (optional, specify
ceiling height)
Units listed below are standard sizes, other sizes available upon request.
CFM Rangeª
Nominal Size
Listed Size
W x H x D NC = 25 NC = 30 W H D
12 x 24 x 12 245 285 12 24 12 5 8 *
18 x 36 x 18 620 720 18 36 18 7 12
24 x 48 x 20 1105 1290 24 48 19 9 16
30 x 48 x 28 1270 1490 30 48 28 11 20
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
C
Inlet
φd
K SP
12 x 24 x 12
18 x 36 x 18
24 x 48 x 20
30 x 48 x 28
2 4 7

Technical Data
Type QL-WV-RO/.../K
Displacement terminal with duct cover for corner mounting
Round inlet connection
90º airflow discharge pattern
W
C
C
d
78"
59"
H
Product Features
• Designed for mounting to a sidewall, 90º discharge
• Round (top) inlet sized for maximum performance
• Integral cover extends to 78 inches in height
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic
changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Mounting Accessories
• Mounting base (optional)
• Extended duct cover (optional, specify
ceiling height)
Performance Data
Units listed below are standard sizes, other sizes available upon request.
Listed Size
W x H x D
CFM Rangeª
W
Nominal Size
NC = 25 NC = 30 W H
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
C
Inlet
φd
12 x 24 200 225 12 24 5 8 *
12 x 36 270 315 12 36 7 8 *
18 x 36 410 485 18 36 9 10 *
24 x 48 990 1150 24 48 11 16
12 x 24 x 12
12 x 36 x 12
18 x 36 x 18
24x 48 x 24
1 3
4

Dimensional Information
Model Type QL QL-WS-RO/...K
- - / K
Displacement terminal for mounting adjacent to sidewall
Round inlet connection
180º airflow discharge pattern
C
D
d
78"
59"
H
Product Features
• Designed for mounting adjacent to
sidewall
• 180º discharge pattern
• Round inlet sized for maximum
performance
• Directional nozzles provide even airflow
across face
• No filter or fabric media requiring
periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Mounting Accesories
• Duct cover extension (optional,
specify ceiling height)
• Mounting base (optional)
Units listed below are standard sizes, other sizes available upon request.
CFM Rangeª
Nominal Size
Listed Size
Inlet
C
W x H x D φd
NC = 25 NC = 30 W H D
16 x 24 x 7 230 255 16 24 7 3 4
16 x 30 x 7 275 310 16 30 7 3 4
16 x 36 x 7 320 365 16 36 7 3 4
16 x 42 x 7 270 430 16 42 7 3 4
20 x 24 x 7 255 290 20 24 7 3 4
20 x 30 x 7 310 350 20 30 7 3 4
20 x 36 x 7 360 410 20 36 7 3 4
20 x 42 x 7 445 525 20 42 7 3 4
24 x 24 x 8 340 380 24 24 8 3 1 /2 5
24 x 30 x 8 415 465 24 30 8 3 1 /2 5
24 x 36 x 8 480 550 24 36 8 3 1 /2 5
24 x 42 x 8 575 675 24 42 8 3 1 /2 5
30 x 24 x 8 395 445 30 24 8 3 1 /2 5
30 x 30 x 8 480 545 30 30 8 3 1 /2 5
30 x 36 x 8 565 640 30 36 8 3 1 /2 5
30 x 42 x 8 680 795 30 42 8 3 1 /2 5
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
22

Technical Data
Type Model QL-WS-RO/...K QL-WS-RO / K
16 x 24 x 7
16 x 30 x 7
16 x 36 x 7
16 x 42 x 7
2 3
5

Dimensional Information
Model QL - WFM - E
Type QL-WFM-E/
Model QL - WFM - E
Displacement terminal for mounting adjacent to a sidewall
Rectangular inlet connection
One way airflow discharge pattern
a
D
b
H
W
Product Features
• Designed for mounting adjacent to a sidewall
• 1 way discharge pattern
• Rectangular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Accessories
• Mounting base (optional)
• Duct cover (optional, specify ceiling height)
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
CFM Range a
Nominal Size Inlet
W x H x D NC = 25 NC = 30 W H D b x a
20 x 24 x 12 190 215 20 24 12 16 x 6
20 x 30 x 12 245 275 20 30 12 16 x 8
20 x 36 x 12 300 340 20 36 12 16 x 8
20 x 48 x 14 415 465 20 48 14 16 x 12
20 x 60 x 14 525 595 20 60 14 16 x 12
24 x 30 x 14 325 370 24 30 14 20 x 10
24 x 36 x 14 400 455 24 36 14 20 x 10
24 x 48 x 14 570 645 24 48 14 20 x 12
24 x 60 x 14 725 820 24 60 14 20 x 12
30 x 30 x 14 450 505 30 30 14 24 x 8
30 x 36 x 14 550 620 30 36 14 24 x 8
30 x 48 x 14 715 810 30 48 14 24 x 12
30 x 60 x 14 910 1025 30 60 14 24 x 12
36 x 36 x 14 700 795 36 36 14 24 x 10
36 x 48 x 14 990 1125 36 48 14 24 x 10
36 x 60 x 14 1265 1435 36 60 14 30 x 10
Actual b & a dimensions are 1/8" less then nominal value in the table
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
24

Technical Data
Model QL-WFM-E
Type QL-WFM-E/
K SP
A EFF
20 x 24 x 12
20 x 30 x 12
20 x 36 x 12
20 x 48 x 14
20 x 60 x 14
Airflow Rate (CFM)
2 4 6 8 L 0.2

Dimensional Information
Type QL-WFM-E-2/
Displacement terminal for mounting adjacent to the sidewall
Rectangular inlet connection
Two way direction airflow discharge pattern
a
D
a
D
... - E2- L ... - E2- R
b
H
W
Product Features
• Designed for mounting adjacent to a sidewall
• Heavy duty reinforced face
• Rectangular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Accessories
• Mounting base (optional)
• Duct cover (optional, specify ceiling height)
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
CFM Rangeª
Nominal Size
Inlet
W x H x D
NC = 25 NC = 30 W H D
b x a
20 x 24 x 12 280 320 20 24 12 16 x 6
20 x 30 x 12 365 415 20 30 12 16 x 8
20 x 36 x 12 450 510 20 36 12 16 x 8
20 x 48 x 14 685 775 20 48 14 16 x 12
20 x 60 x 14 865 985 20 60 14 16 x 12
24 x 30 x 14 485 540 24 30 14 20 x 10
24 x 36 x 14 585 650 24 36 14 20 x 10
24 x 48 x 14 840 960 24 48 14 20 x 12
24 x 60 x 14 995 1170 24 60 14 20 x 12
30 x 30 x 14 605 670 30 30 14 24 x 8
30 x 36 x 14 720 835 30 36 14 24 x 8
30 x 48 x 14 960 1110 30 48 14 24 x 12
30 x 60 x 14 1215 1410 30 60 14 24 x 12
36 x 36 x 14 900 1020 36 36 14 24 x 10
36 x 48 x 14 1205 1410 36 48 14 24 x 10
36 x 60 x 14 1555 1810 36 60 14 30 x 10
Actual b & a dimensions are 1/8" less then nominal value in the table
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
26

Technical Data
Type Model QL-WFM-E-2/ QL-WFM-E-2
K SP
A EFF
20 x 24 x 12
2 3 5 7
L 0.2

Dimensional Information
Model
Model
QL - WFM
QL -
-
WFM
E - 3
- E - 3
Type QL-WFM-E-3/
Displacement terminal for mounting adjacent to a sidewall
Rectangular inlet connection
Three way airflow discharge pattern
a
D
b
H
W
Product Features
• Designed for mounting adjacent to a sidewall
• 3 way discharge pattern
• Rectangular inlet sized for maximum performance
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Mounting Accesories
• Mounting base (optional)
• Duct cover (optional, specify ceiling height)
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
CFM Range a
Nominal Size Inlet
W x H x D NC = 25 NC = 30 W H D b x a
20 x 24 x 12 375 425 20 24 12 16 x 6
20 x 30 x 12 490 550 20 30 12 16 x 8
20 x 36 x 12 590 675 20 36 12 16 x 8
20 x 48 x 14 930 1075 20 48 14 16 x 12
20 x 60 x 14 1080 1270 20 60 14 16 x 12
24 x 30 x 14 650 735 24 30 14 20 x 10
24 x 36 x 14 800 905 24 36 14 20 x 10
24 x 48 x 14 1065 1250 24 48 14 20 x 10
24 x 60 x 14 1185 1390 24 60 14 20 x 12
30 x 30 x 14 770 870 30 30 14 24 x 8
30 x 36 x 14 925 1065 30 36 14 24 x 8
30 x 48 x 14 1270 1450 30 48 14 24 x 12
30 x 60 x 14 1535 1790 30 60 14 24 x 12
36 x 36 x 14 1080 1235 36 36 14 24 x 10
36 x 48 x 14 1330 1560 36 48 14 24 x 10
36 x 60 x 14 1735 2035 36 60 14 30 x 10
Actual b & a dimensions are 1/8" less then nominal value in the table
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
28

Technical Data
Model QL-WFM-E-3
Type QL-WFM-E-3/
K SP
A EFF
20 x 24 x 12
20 x 30 x 12
2 4
6 7
2 3 5 7 L 0.2

Dimensional Information
Model QL - WFT - …..
Type QL-WFT...
Displacement terminal for mounting to sidewall
Rectangular (QL-WFT-E) or round (QL-WFT-RO) inlet
Heavy duty reinforced face
One way airflow discharge pattern
a + 1
a
b
D
Model QL-WFT-E
d
D
Model QL-WFT-RO
H
W
Product Features
• Designed for mounting to a sidewall
• Rectangular (QL-WFT-E) or round (QL-WFT-RO)
inlets sized for maximum performance
• One way discharge pattern
• Heavy duty reinforced face for industrial applications
• Directional nozzles provide even airflow across face
• Additional sizes available on request
• No filter or fabric media requiring periodic changeout
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 18% free area
• All surfaces powder coat white
Accessories/Options
Inlet Location
• Top inlet (standard)
• Bottom inlet (optional)
Units listed below are standard sizes, other sizes are available upon request.
Model QL-WFT-E
Listed Size
CFM Range a
Nominal Size
W x H x D NC = 25 NC = 30 W H D
24 x 48 x 10 415 470 24 48 10 24 x 8
31 x 36 x 10 375 425 30 1 /2 36 10 24 x 8
31 x 48 x 10 520 585 30 1 /2 48 10 24 x 8
31 x 60 x 10 715 805 30 1 /2 60 10 24 x 8
31 x 72 x 10 835 950 30 1 /2 72 10 24 x 8
36 x 48 x 10 625 705 36 48 10 28 x 8
36 x 60 x 10 855 970 36 60 10 28 x 8
36 x 72 x 10 1000 1140 36 72 10 28 x 8
Model QL-WFT-RO
Listed Size
CFM Range a
Nominal Size
W x H x D NC = 25 NC = 30 W H D
Inlet
b x a
24 x 48 x 14 460 525 24 48 14 8 *
31 x 36 x 14 405 460 30 1 /2 36 14 8 *
31 x 48 x 16 580 660 30 1 /2 48 16 14
31 x 60 x 19 775 880 30 1 /2 60 19 16
31 x 72 x 19 880 1015 30 1 /2 72 19 16
36 x 48 x 19 700 795 36 48 19 16
36 x 60 x 19 890 1035 36 60 19 16
36 x 72 x 19 975 1145 36 72 19 16
* Optional VFL flow limiter (see page 41 for details) available for these inlet sizes
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
Inlet
d
30

Technical Data
Model QL-WFT-E
Type QL-WFT-E
24 x 48 x 10
31 x 36 x 10
31 x 48 x 10
31 x 60 x 10
3 6
9 11

Dimensional Information
Type QL-WQT-RO
Displacement terminal for free standing mounting
Heavy duty reinforced face
Round inlet connection
Two, three or four way airflow discharge pattern
W
WQT-RO-2 WQT-RO-3 WQT-RO-4
d
H
W
Product Features
• Designed for free standing or sidewall mounting
• 2, 3 or 4 way discharge pattern
• Round inlet sized for maximum performance
• Heavy duty industrial construction
• Directional nozzles provide even airflow across face
• No filter or fabric media requiring periodic changeout
• Additional sizes available on request
Construction / Finish
• Front face is 18 ga. steel
• Plenum box and nozzle plate 20 ga. steel
• Perforated face is 20% free area
• All surfaces powder coat white
Units listed below are standard sizes, other sizes are available upon request.
Listed Size
CFM Rangeª Nominal Size Inlet
W x H
NC = 25 NC = 30 W H
d
QL-WQT-RO-2
30 x 48 1040 1175 30 48 26
30 x 60 1430 1615 30 60 26
36 x 60 1715 1940 36 60 32
36 x 72 2025 2290 36 72 32
QL-WQT-RO-3
30 x 48 1560 1765 30 48 26
30 x 60 2140 2420 30 60 26
36 x 60 2570 2905 36 60 32
36 x 72 3035 3435 36 72 32
QL-WQT-RO-4
30 x 48 2075 2345 30 48 26
30 x 60 2745 3175 30 60 26
36 x 60 3410 3870 36 60 32
36 x 72 4000 4540 36 72 32
ŧ Actual inlet diameter (φd) is 1/8" less then nominal value stated in the table.
ª NC values include 10 dB room absorption in each octave band (125-4000 Hz)
32

Technical Data
Type QL-WQT-RO-2
K SP
A EFF
30 x 48
30 x 60
36 x 60
36 x 72
2 5 7

Technical Information
General technical information regarding
displacement ventilation systems
Mixed air systems, widely used in North American nonresidential
HVAC systems, discharge supply air at relatively
high velocities in an attempt to create high levels of room air
entrainment. The resultant room air mixture is homogenous
with respect to both temperature and airborne (gaseous) contaminant
levels. Heat gains are well distributed resulting in
their sum having to be treated by the conditioned air passing
through the space. Due to the outlets’ relatively high discharge
velocities, they are generally located at the ceiling or otherwise
separated from the occupied zone (stationary residents).
Unlike mixed air systems, displacement conditioning systems
discharge conditioned air at low velocities (typically 60 fpm or
less) in an attempt to minimize entrainment and mixing with
room air. As such the supply air stream quickly falls to the floor
and spreads across the lower level of the space similar to a
liquid spill. This conditioned air is confined to the lower part of
the space by warmer ambient air above it.
Convective heat sources transferring heat to the ambient
air around them create natural convection plumes that rise
vertically above them. These plumes will rise to the level where
they either encounter equally warm air or a physical boundary
such as a ceiling. Air from beneath the heat source is drawn
upward to replenish that displaced by the rising convection
plume. If a heat source is near the supply air layer, it is this
conditioned air that is drawn up over it, making a single vertical
pass through the space. The entrained air conditions the
heat source and transports any respiratory and/or olfactory
contaminants associated with the source to the upper part of
the space where the return air inlet is located.
Displacement outlets are generally positioned in the floor or
at a low sidewall location, but in certain circumstances may
also be located above the occupied zone. As such, a higher
discharge air temperature (typically 62 to 67ºF) is usually
employed where stationary occupants are involved.
Temperature gradients and occupant thermal
comfort in displacement systems
The room air mixture in areas conditioned by displacement
systems remains thermally stratified with the lowest temperature
air remaining at the floor and the warmest in the region
adjacent to the ceiling.
As displacement outlets are generally located within or near
the occupied zone, a certain separation between the outlet
and the occupants should be observed to avoid draft
problems. Stationary occupants should not be located within
the area adjacent to the outlet in which velocities exceeding
40 fpm (0.2 m/s) are likely to be found. This area is referred
to as the outlet’s adjacent or near zone and is denoted by the
nomenclature L 0.2
. The extent of this zone is determined by the
outlet’s height, geometry and face velocity as well as the temperature
difference between the room and supply air.
TROX displacement outlets utilize an array of nozzles specifically
designed to maximize the spread of the supply airflow
across the outlet face. In addition to providing pressure equalization,
these nozzles also serve as turning devices that scoop
the supply air and turn it such that its flow direction is perpendicular
to the diffuser face. By doing so, TROX is able to offer
the shortest adjacent zones in the industry allowing more efficient
use of the floor space by the occupants.
The performance charts in this leaflet indicate outlet adjacent
zones for a temperature differential (Δt u
) of 10ºF (5.6ºK)
between the room and supply air. Table 1 (page 2) provides L 0.2
correction factors for other Δt u
values.
ANSI/ASHRAE Standard 55-2004 Thermal Environmental
Conditions for Human Occupancy limits the temperature gradient
between the ankle and head level of stationary space
occupants to no more than 3ºK (5.4ºF) if a high level of thermal
comfort (10% or less PPD) is to be maintained. The ankle and
head levels of seated occupants are considered to be 0.1 and
1.1 m (4 and 42 inches) respectively.
Contaminant removal and ventilation effectiveness
with displacement systems
The single vertical passage of air in the vicinity of the occupants
results in enhanced contaminant removal efficiencies
as well as more effective space ventilation. Table 6-1 of ANSI/
ASHRAE Standard 62.1-2004 Ventilation for Acceptable Indoor
Air Quality awards thermal displacement systems a ventilation
effectiveness of 1.2 which essentially means that similar ventilation
effects can be produced by displacement systems delivering
twenty (20) percent less outdoor air than a fully mixed
room air distribution system. A recent ASHRAE research project
(RP-1373) studied the ventilation effectiveness of displacement
systems in various applications and suggests that the
ventilation effectiveness of thermal displacement systems is as
high as 1.35 for offices and classrooms and 2.0 for workshops
and auditoriums.
34

Technical Information
Supply temperature and airflow relationships
for displacement systems
Although displacement supply air temperatures are typically
several degrees warmer than those employed in conventional
mixed air systems, the return air temperature is also higher,
resulting in a space supply airflow rate that is usually quite
similar.
The design nomograph presented on page 38 affords the
designer a method to easily identify a supply airflow rate that
is sufficient to satisfy the space heat gains while maintaining
a high level of occupant thermal comfort. Use of this chart
and the associated airflow rate determination procedures will
assure that the required cooling is accomplished while limiting
the space vertical temperature gradient to less than 1ºF
per foot (3.6ºK) as prescribed by ANSI/ASHRAE Standard
55-2004. Design examples for a classroom and an atrium are
provided to assist in the use of this chart.
Common applications favoring displacement conditioning
systems
Displacement conditioning is ideal for applications where highly
efficient gaseous contaminant removal is desired. Classrooms,
waiting areas and patient rooms in hospitals commonly rely on
displacement systems to reduce ambient CO 2
levels, thereby
reducing the risk of disease spread by respiratory means.
Industrial applications often rely on displacement systems to
allow warm gases and their associated fumes to escape occupied
levels naturally.
Displacement systems are also often used to reduce HVAC
energy requirements. The thermal stratification produced by
displacement systems can be applied to high ceiling areas
such as atriums and transportation halls to isolate rising heat
plumes to the upper levels of the space. This results in higher
supply to return air temperature differentials which require
lower supply airflow rates than mixed air systems.
Displacement systems can also be effectively employed in
spaces where the removal of odors associated with heat
sources is desired. Applications such as restaurants and casinos
where smoking is allowed are such examples. Odors associated
with space heat sources (food or tobacco smoke) are
transported out of the occupied zone by their thermal plumes
and do not affect the other occupants of the space.
Application recommendations regarding
displacement conditioning systems
Certain limitations should be observed when designing thermal
displacement systems. Among these are,
1. For most applications (well distributed space heat
gains up to about 30 btuh/ft 2 ), displacement diffusers
are capable of serving an area within about a thirty
foot radius of the diffuser face. This area may be
reduced when greater space heat loads are present or
when high intensity heat sources are located near the
floor and within the coverage radius aforementioned.
2. Supply air temperatures for displacement systems
serving spaces with primarily stationary occupants
should be no more than 14 °F below the room temperature
at the occupants’ head level. In the case of
transient occupancy, this differential can be as high as
20 °F.
3. Average face velocities should be maintained at 60
fpm (0.3 m/s) or less for thermal comfort applications
involving stationary occupants. These may be as high
as 80 fpm (0.4 m/s) when applied to industrial spaces
or to spaces with transient occupancy.
4. When used for thermal comfort applications the space
vertical temperature gradient should not exceed 1 °F
per linear foot (2°K per linear meter).
5. Stationary occupants should not be located within
identified outlet adjacent zones (L 0.2
) in order to assure
that the occupants are not subjected to cold drafts
near their ankles.
6. When used in applications requiring a high degree
of occupant thermal comfort, unit heights should be
limited to no more than five (5) feet as taller units tend
to create a “waterfall” effect which extends adjacent
zones and results in higher associated draft risks.
7. Heating with displacement systems should not be
attempted except in very mild climates, therefore a
separate heating system is generally required. In
cases where heating is done by the displacement diffusers,
ventilation effectiveness advantages are offset
by the vertical rise of the warm air near its point of
discharge.
35

Displacement Chilled Beams
Although displacement systems are highly regarded for their
contamination removal efficiencies, there are dehumidification
and associated energy issues which have limited their use in
high humidity areas within North America.
Displacement outlets systems employ higher discharge air temperatures
(typically 62 to 67°F) than those used for mixed air
systems. In order to satisfy the space latent load, the mixture of
outside and return air being reconditioned by the air handling
unit’s cooling coil must be lowered to a similar dew point temperature,
typically 52 to 54°F (11 to 12°C), as that of a mixed
air system. Conventional cooling/dehumidification systems cool
the supply air mixture to such a dew point temperature, then
somehow reheat it prior to its delivery to the space. Figure 1
illustrates such a process utilizing a bypass of return air around
the cooling coil to reheat the mixture to its desired delivery temperature.
Dedicated outdoor air systems (DOAS) with desiccant
capabilities can provide lower dew point temperatures without
such reheat but cost much more than conventional air handling
equipment.
Outdoor
Air
Return Air
(80 to 85°F)
Figure 1: AHU configuration for an all-air displacement
system in humid climate
Supply Air
(62 to 67°F)
TROX QLCI series displacement chilled beams combine the
energy savings of an air water system with the acoustical and
contamination removal benefits of a displacement system. Primary
air is delivered from the air handling unit at a conventional
supply air temperature (53 to 57 °F) and injected though a series
of nozzles which entrain room air through the face of the beam
and an integral heat transfer coil. This entrained air is reconditioned
then mixed with the primary air. This mixture is discharged
to the space at a air temperature that varies according to the
instantaneous space cooling requirement. The heat transfer coil
utilizes chilled water supplied at a temperature at or above the
room dew point temperature in order to prevent condensation on
its surfaces.
Displacement chilled beams remove approximately 60% of
the space sensible heat gain by means of their chilled water,
enabling the primary airflow rate to be reduced accordingly.
The use of conventional ducted air temperatures eliminates the
need for reheat on the AHU. Coupled with the primary airflow
reduction affected by their sensible cooling coil, displacement
chilled beams offer significant reductions in ductwork and air
handling unit size as well as operational cost savings.
Primary air from AHU
(53 to 57°F)
Chilled water supply
Induced room air
(74 to 76°F)
Displacement chilled beams are ideal for use in classrooms and
healthcare applications. In the latter case, a MERV-8 filter can be
supplied if required. For more information on QLCI displacement
chilled beams, please contact TROX USA or visit our website at
www.troxusa.com.
Supply air to space
(62 to 68°F)
Figure 2: TROX QLCI series displacement chilled beams
36

Temperature relationships - Nomenclature
Q Btuh/ft² Heat load (per square foot of floor area)
CFM
Supply flow rate
/A CFM/ft² Supply flow rate per ft² floor area
ρ lb/ft³ Air density
c p btuh/lb - °F Specific heat of air
h R ft Room height
t Z °F Supply air temperature
t h1 °F Air temperature at approx. 4 in (0.1 m) above the floor
t h2 °F Room temperature at approx. 42 in (1.0 m) above the floor
t A °F Extract air temperature
Δt °F Difference between extract air temperature and supply air temperature
Δt 1 °F Difference between floor air temperature t h1 and supply air temperature t Z
Δt u °F Difference between room temperature t h2 and supply air temperature t Z
Δt C °F Temperature gradient (t h2 – t h1 ) within the occupied zone
L 0.2 ft Radius of diffuser adjacent zone
Design chart on page 38 is based on standard air at sea level
ρ = .075 lb/ft 3
c p = 0.24 btu/lb-°F
37

Design Nomograph Supply airflow determination
ρ = .075 lb/ft 3
c p = 0.24 btu/lb-°F
t
°F
34
CFM/ft 2
0.2 0.4 0.6 0.8 1.0 1.2 1.4
t u
°F
20
16 15
14
13
t 1
°F
32
19
12
30
1.6
18
28
26
1.8
17
16
2
11
10
24
2.0
2
15
14
9
22
20
2.2
2.4
13
12
rH
16 ft
1
8
18
16
14
2.6
2.8
3.0
1
fpm
11
10
9
8
rH = 14 ft
rH = 12 ft
rH = 10 ft
7
6
5
12
7
1
2
4
10
6
rH = 8 ft
3
8
1
2 1 2
5
6
4
3
4
2
2
0
0 8 16 24 32 40
48
8
10 12 14
16
0.5 1.0 1.5 2.0 2.5 3.0
Sensible Heat Gain Q SENS (Btuh/ft 2 )
Room Height rH (ft.)
Airflow Rate (CFM/ft 2 )
Procedure for supply airflow rate determination
1. Enter the center section of the design chart and draw a vertical line that coincides with the ceiling height (rH).
2. Identify where the vertical line intersects the desired under temperature (Δt u
). The under temperature is the
temperature differential between the room and supply air.
3. Draw a horizontal line through the intersection that spans all three sections of the design chart. The resultant
temperature differential (Δt) between the supply and exhaust air is indicated on the left side of the chart.
4. Draw a vertical line (coincident with the space sensible heat gain) through the left section of the chart. Identify the point
where this line intersects with the horizontal line drawn in step 3. The intersection of these lines identifies the required
supply airflow rate for the under temperature (Δt u
) specified.
5. Enter the right section of the chart and draw a vertical line corresponding to the supply airflow rate identified in step 4.
The intersection of this and the horizontal line (from step 3) will identify the value of Δt 1
.
6. If the intersection point is left of the curve relating to the applicable ceiling height, a good comfort level (T R
– T B
≤ 3.6 ºF)
will be achieved. The actual value of T R
– T B
can be determined by subtracting Δt 1
from Δt u.
38

Design Examples
Example 1:
A 900 square foot classroom is to be served by displacement
ventilation with a supply air temperature of 64 ºF. The classroom
ceiling height is 10 feet.
The design criteria are as follows:
Q SENS
= 27,000 Btuh = 30.0 Btuh/ft 2
T R
= 76 ºF
T R
– T B
≤ 3.6 ºF
Δt u
= T ROOM
– T SUPPLY
= 76 – 64 = 12 ºF
Determine the supply airflow rate that will satisfy the design
requirements.
Solution:
1. At (Δt u
) of 12 ºF and rH = 10 feet, Δt = 17.9 ºF
2. The intersection of the vertical line running through
Q SENS
= 30 Btuh/ft 2 and the horizontal line at Δt =
17.9ºF indicates that the required supply airflow rate
will be 1.55 CFM/ft 2 .
3. A vertical line drawn through the supply airflow rate
of 1.55 CFM/ft 2 intersects the horizontal line at Δt 1
=
8.8 ºF. The occupied zone temperature differential
(T R
– T B
) is approximately 3.2 ºF (see step 6 of the
procedures above). This is compliant with the design
criteria.
Diffuser selection:
Two (2) QL-WV-RO diffusers will be placed in the corners of
the classroom opposite its outside wall. ANSI S12.60 stipulates
that the background noise level for the classroom not exceed
NC27.
The supply airflow requirement for the classroom is 1.55 CFM/
ft 2 or 1,395 CFM, thus each unit must supply 698 CFM.
The performance data for the QL-WV-RO on page 19 indicates
that a size 24 x 48 terminal can supply the required airflow at
an NC less than 25. The inlet static pressure (ΔP S) for this flow
rate can be calculated by inserting and the KSP factor (2,927)
into the formula on page 2:
ΔP S = (698/2,927) 2 = .057 in.w.g.
The near zone value (7 feet) must be multiplied by the correction
factor for Δt U (1.14) in table 2, indicating occupants should
not be located within eight (8) feet of the corner mounted diffusers.
Example 2:
A 2,000 square foot atrium is to be served by displacement
ventilation with a supply air temperature of 62 ºF. The ceiling
height is 20 feet.
The design criteria are as follows:
Q SENS
= 90,000 Btuh = 45 Btuh/ft 2
T R
= 76 ºF
T R
– T B
≤ 3.6 ºF
Δt u
= T ROOM
– T SUPPLY
= 76 – 62 = 14 ºF
Determine the supply airflow rate that will satisfy the design
requirements.
Solution:
1. At (Δt u
) of 14 ºF and rH = 16+ feet, Δt = 23.2 ºF
2. The intersection of the vertical line running through
Q SENS
= 45 Btuh/ft 2 and the horizontal line at Δt =
23.2ºF indicates that the required supply airflow rate
will be 1.78 CFM/ft 2 .
3. A vertical line drawn through the supply airflow rate
of 1.78 CFM/ft 2 intersects the horizontal line at Δt 1
=
11 ºF. The occupied zone temperature differential (T R
– T B
) is approximately 3 ºF (see step 6 of the determination
procedures). This is compliant with the design
criteria.
Diffuser selection:
Three (3) QL-WH-RO diffusers will be spaced equally along an
inside wall. As this is an atrium and its occupants are primarily
transient, NC levels up to 40 will be considered acceptable.
The supply airflow requirement for the classroom is 1.78 CFM/
ft 2 or 3,560 CFM, thus each unit must supply 1,187 CFM.
The performance data for the QL-WH-RO on page 17 indicates
that a size 20 x 48 x 20 terminal can supply the required airflow
at an NC of around 32 . The inlet static pressure (ΔP S) for
this flow rate can be calculated by inserting and the KSP factor
(3,152) into the formula on page 2:
ΔP S = (1,187/3,152) 2 = 0.14 in.w.g.
The near zone value (7 feet) must be multiplied by the correction
factor for Δt U (1.62) in table 2, but the fact that occupants
are transient makes this value relatively unimportant.
39

Mounting details
4
Installation and Mounting
Models QL-WE-E, QL-WE-RO and QL-WE-O
3
1. Remove face from unit (face snaps out).
2. Insert plenum/nozzle assembly between wall studs.
3. Fasten plenum/nozzle assembly to wall studs.
2
4. Install and connect inlet ductwork.
6
5. Complete drywall installation.
6. After all drywall installation is complete, re-install face.
Hatch as wood stud
5
7
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Installation and Mounting
Models QL-WV-RO/…, QL-WH-RO/…,
and QL-WS-RO/K
1. If applicable, attach mounting base to floor.
2. Attach lower mounting angles to drywall.
3. Place unit on base (where applicable) and attach to
lower angles.
6
4. If applicable, cut upper angles to extend above the
ceiling plane.
3
5. If applicable, attach upper mounting angles to wall.
2
1
3
6. Attach inlet ductwork.
7. If applicable, attach duct cover to upper mounting angles.
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Installation and Mounting
Models QL-WF-E, and QL-WF-RO
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5
6
5
7
1. If applicable, attach mounting base to floor.
2. Remove face (snaps out) and nozzle plate.
3. Fasten unit to floor (or mounting base) and wall as shown.
4. If applicable, cut mounting angles to extend above
the ceiling.
5. If applicable, attach mounting angles to wall.
2
2
6. Attach inlet ductwork.
7. If applicable, attach duct cover to mounting angles.
3
1
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mouting-3.ai

Volume Flow Limiter
4
1
4
Installation and Mounting
Models QL-WFM-E/…, and QL-WFT-E
1. Attach mounting angles to wall.
2. Position unit between mounting angles.
3. Fasten unit to mounting angles.
4. Attach inlet ductwork.
2
3
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Volume control options
Installation and Mounting
TROX model VFL flow regulators can be fitted directly to the
round inlet connection on certain displacement units. This limiter
is fully self-contained and requires no power or control connections.
It may be field set to maintain a constant volume flow rate
to the unit. The VFL compensates for system pressure changes
to maintain the beam’s design airflow rate.
VFL flow limiters require a minimum of 0.15 inches H 2
O differential
static pressure to operate. This must be added to the
catalogued pressure loss of the displacement unit to arrive at
an appropriate inlet static pressure requirement. For acoustical
reasons, the inlet static pressure should not exceed 1.0 inches
H 2
O. More information on VFL flow limiters may be found in
TROX leaflet 5/9.2/EN/3.
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Specification text
General information
TROX displacement flow diffusers for optimum discharge of conditioned air to the room using the displacement flow principle. Completely
uniform velocity profile with special nozzles with integral air deflection scoops.
Type QL-WE-E/ for flush installation in a framed wall
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to
the face plate. Perforated flat sheet metal face providing a
low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional.
Rectangular air inlet.
Type QL-WE-RO/ for flush installation in a framed wall
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to
the face plate. Perforated flat sheet metal face providing a
low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional.
Round air inlet.
Type QL-WE-O/ for flush installation in a framed wall
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to
the face plate. Perforated flat sheet metal face providing a
low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional.
Plenum by others.
Type QL-WF-E/ and Type QL-WF-RO/ for sidewall installation,
one way discharge, available with base and duct cover
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Compact welded construction. Perforated flat sheet metal
face providing a low-turbulence low velocity discharge, galvanized
sheet steel, powder-coated, standard color white, other colors optional.
Type QL-WF-E has rectangular inlet
connection. Type QL-WF-RO has round inlet connection.
Options: base and/or duct cover.
Type QL-WH-RO/ and Type QL-WH-RO/.../K semi circular unit
for sidewall installation, available with base
Air distribution face plate with integral geometrically arranged
plastic nozzles with deflection scoops. Every nozzle provides a
constant flow rate from the passing airstream and directs it to the
face plate. Perforated sheet metal face providing a lowturbulence
low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
air inlet.
Type QL-WH-RO/ without a duct cover
Type QL-WH-RO/.../K with a duct cover (78’’ tall), base and/or
duct cover extension on request.
Type QL-WV-RO/ and Type QL-WV-K-RO/.../K
quarter-round unit for corner installation, available with
base
Air distribution face plate with integral geometrically arranged
plastic nozzles with deflection scoops. Every nozzle provides a
constant flow rate from the passing airstream and directs it to the
face plate. Perforated sheet metal face providing a lowturbulence
low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
air inlet.
Type QL-WV-RO/ without a duct cover
Type QL-WV-RO/.../K with a duct cover (78’’ tall), base and or
duct cove extension on request.
Type QL-WS-RO/.../K bow shaped unit for sidewall
installation with a duct cover, available with base
Rear panel with connecting spigot of galvanized sheet steel. Air
distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face plate.
Perforated sheet metal face providing a lowturbulence
low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Duct
cover (78’’ tall), round air inlet. Option: Duct cover extension and/
or base.
Type QL-WR-RO/ circular unit for freestanding installation,
available with base and duct cover
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to
the face plate. Perforated sheet metal face providing a lowturbulence
low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
air inlet. Options: duct cover (fabricated in 2 half sections) and/or
base.
42

Specification text
Type QL-WFM-E-../ for sidewall installation, various
discharge models available with base
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Perforated flat sheet metal face providing a low-turbulence
low velocity discharge, galvanized sheet steel, powder-coated,
standard color white, other colors optional. Face with high-quality
finish: aluminium borders and no visible screws. Rectangular inlet
connection. Option with base.
Type QL-WFM-E/, one way discharge, Type QL-WFM-E-2/,
two way discharge, face and left or right, Type QL-WFM-E-3/,
three way discharge
Type QL-WFT-RO/ for sidewall installation with
reinforced face
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
inlet connection.
Type QL-WFT-E/ for sidewall installation with
reinforced face, one way discharge
Air distribution face plate with integral geometrically arranged
plastic nozzles with deflection scoops. Every nozzle provides a
constant flow rate from the passing airstream and directs it to the
face plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet
steel, powder-coated, standard color white, other colors optional.
Rectangular inlet connection.
Type QL-WQT-RO-2/ for square sidewall installation on wall
with reinforced face, two way discharge
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
inlet connection.
Type QL-WQT-RO-3/ for sidewall free standing installation
with reinforced face, three way discharge
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
inlet connection.
Type QL-WQT-RO-4/ for free standing installation with
reinforced face, four way discharge
Air distribution face plate with integral geometrically arranged plastic
nozzles with deflection scoops. Every nozzle provides a constant
flow rate from the passing airstream and directs it to the face
plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet steel,
powder-coated, standard color white, other colors optional. Round
inlet connection.
Type QL-WFT-E2/ for sidewall installation with reinforced
face, rectangular connecting spigot, two way discharge,
without base
Air distribution face plate with integral geometrically arranged
plastic nozzles with deflection scoops. Every nozzle provides a
constant flow rate from the passing airstream and directs it to the
face plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet
steel, powder-coated, standard color white, other colors optional.
Rectangular inlet connection.
Type QL-WFT-E3/ for installation on a wall surface with
reinforced face, three way discharge
Air distribution face plate with integral geometrically arranged
plastic nozzles with deflection scoops. Every nozzle provides a
constant flow rate from the passing airstream and directs it to the
face plate. Reinforced perforated face plate of metal sheet providing
a low-turbulence low velocity discharge, galvanized sheet
steel, powder-coated, standard color white, other colors optional.
Rectangular inlet connection.
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Order details
Order code
QL - WE - RO - 0 - 0 / W×H×D - . 0 / 0 / 0 / 0 / RAL ..
Type
WE = Flush installation in a wall
WF = Installation on a sidewall
WFT = Installation on a sidewall,
reinforced face
WFM = Installation on a sidewall multiway
discharge
WV = Quarter-round for corner installation
WS = Bow shaped installation on a sidewall
WH = Semi circular, installation on a sidewall
WR = Circular, installation free standing
WQT = Square unit for installation on a sidewall
surface, in a corner or free standing,
reinforced face
Inlet connection
RO
RU
E
EU
O
= Round inlet (top)
= Round inlet (bottom)
(not possible with Type QL-WS)
= Rectangular inlet (top)
= Rectangular inlet (bottom)
= Without plenum box
Duct cover
Finish
RAL color as required
0 = Standard color (white)
P1 = RAL as required
A2 = Stainless (polished)
Mounting base
0 = Without base (Standard)
Sx = Base height
x = 2, 3, 4, 6 inches
0 = Without duct cover (Standard)
K1 = Duct cover for room heights 7.5 - 8.5 ft
K2 = Duct cover for room heights 8.5 - 9.5 ft
K3 = Duct cover for room heights 9.5 - 10.5 ft
K4 = Duct cover for room heights 10.5 - 12.0 ft
Design changes reserved. All rights reserved © TROX USA, Inc. (03/2013)
Discharge pattern
0 = Standard
2 = Two way discharge (WQT)
3 = Three way discharge (WQT, WFM)
4 = Four way discharge (WQT)
2L = Two way discharge, face and left sides (WFM)
2R = Two way discharge, face and right side (WFM)
Volume control options
0 = Standard
V = VFL volume regulator
(for round inlet dia. 4, 5, 6, 8, 10)
Unit size (nominal)
W × H × D
Width × Height × Depth
W x H (WR, WV, WQT)
h R
78
Inlet configuration
0 = Without connection
n × d = Number of inlets (i) × Inlet diameter
b × a = Inlet width × Inlet depth
Detail of duct cover
Order examples
15 units QL-WF-E/24×36×8-14×6 standard diffusers with rectangular air inlets
24 units QL-WH-RO/18×30×18-1×10/K2 standard diffusers with duct covers for room heights 8.5 to 9.5 feet
20 units QL-WE-O/15×24×3.75 standard diffusers without plenum box
h
59
ød
Kx
H
Sx = Base height (x in inches)
h R = Room height
Kx = Duct cover extension
(telescopic)
x= 1...4 depending
on room height
Sx
44