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from moisture generated by boiling large pots of
water or the grease and smoke resulting from
grilling or frying.
What about cooking surfaces in peninsulas or islands?
A larger-capacity kitchen range hood can
provide better capture when there are crosscurrents
and when the hood needs to be mounted
higher. Downdraft kitchen exhausters are an acceptable
alternative. Larger kitchen range hoods,
as well as downdraft kitchen exhausters, are stylishly
designed to complement the wide variety of
styles of today’s kitchens.
The majority of kitchens in newly built homes
are equipped with kitchen range hoods. Older
homes present an opportunity for new installations
to upgrade kitchen ventilation with a kitchen range
hood or a downdraft kitchen exhauster. However,
if neither is an option, homeowners may select
kitchen fans, which will provide good general ventilation
in the kitchen. Kitchen fans may be used
alone or with kitchen range hoods. They can also
provide fresh airflow during periods when the
cooking surface is unused.
It is important to note that nonducted, recirculating
kitchen range hoods provide no real ventilation
– they simply recirculate the air collected from
the cooktop back into the kitchen. They do not reduce
moisture and have limited value in managing
odors. For optimum kitchen air quality, always use
kitchen range hoods, downdraft kitchen exhausters
or fans, which vent directly to the outside
of the home.
INLINE FANS
Inline fans present an attractive option for homeowners
who want to locate the fan away from the room or rooms
that need exhausting.
Inline fans are mounted inline with the ductwork, bringing
air from the inside and to the outside of the home. An inline
fan may also be described as a remote-mounted fan.
Inline fans are useful for applications that include:
■ Ventilation of wet spaces such as bathrooms, kitchens
and laundries;
■ Remote fans for kitchen range hoods;
■ Duct boosters for ventilation systems and clothes dryers;
■ Supply or exhaust fans for continuous whole-house
ventilation; and
■ Radon mitigation systems.
Inline fans come in many different configurations, sizes
and capabilities to meet a wide variety of ventilation needs.
They are available as simple single-port versions or versatile
multiport versions. Single-port units have one incoming
supply duct and one outgoing exhaust duct. Multiport
versions have multiple ducts with a minimum of one inlet
and one exhaust. A single fan can then manage air
movement to or from multiple locations (e.g., two
bathrooms). By varying duct sizes, inserting “Y” fittings to
branch duct runs, employing adjustable grille openings and
varying the fan speeds, different ventilation rates are
possible for each location connected. Multiport versions
offer ventilation capacity appropriate for larger-scale singlefamily,
multifamily and commercial buildings.
Inline fans are available in a range of airflow capacities
from about 100 CFM, suitable for many housing needs, to
2,000 CFM for commercial applications. Manufacturers offer
a variety of sizes, flow capacities, ducting configurations,
controls and accessories.
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