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HOME Ventilation
Guide
How Much
Ventilation Do I Need?
HVI’s ventilation guidelines.
Ventilation products have differing capacities
for moving air, making it important to ensure
the product being selected has ample capacity
for the application. HVI’s Certified airflow rating
appears on the product or on the HVI label displayed
on each unit, in the manufacturer’s literature describing
the fan and in the HVI Certified Home Ventilating
Products Directory available at www.hvi.org.
The following guidelines will help you to determine
the fan capacity required for your application.
• A timer or other control that ensures ventilation
continues for a minimum of 20 minutes after each
use of the bathroom should be installed in each
bathroom.
Bathrooms – intermittent ventilation
HVI recommends the following intermittent ventilation
rates for bathrooms:
Bathroom size Calculation formula Ventilation rate required
Less than 1 CFM per sq. foot A minimum of 50 CFM
100 sq. feet of floor area
More than Add the CFM Toilet 50 CFM
100 sq. feet requirement Shower 50 CFM
for each fixture Bathtub 50 CFM
Jetted tub 100 CFM
• An enclosed toilet should have its own exhaust
fan.
• Fans approved for installation in wet areas
should be located over the shower or tub whenever
possible.
• Bathroom doors need to have at least 3/4" clearance
to the finished floor to allow proper entry of
makeup air.
Photo courtesy of Broan-NuTone LLC
• For steam rooms, HVI recommends a separate
fan located in the steam room that can be turned on
after use to clear the heat and humidity.
Bathrooms – continuous ventilation
Continuous ventilation at a minimum rate of 20
CFM may be used in lieu of an intermittent 50 CFM
exhaust fan.
Kitchen range hoods
Recommended kitchen range hood ventilation
rates vary greatly depending on the type of cooking
30
H V G
www.hvi.org