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CFM per Room Calculator

How to Calculate CFM per Room

To calculate the required CFM for a room, you need to know the room's dimensions and the air changes per hour (ACH) for the room type. The formula is:

CFM = (Room Volume in cubic feet x ACH) / 60

Use the form above to input the room dimensions and select the room type, and the calculator will provide the required CFM range.

Room ACH Requirements

Building/Room Air Changes per Hour (ACH)
Residential
Basements 3-4
Bedrooms 5-6
Bathrooms 6-7
Living rooms 6-8
Kitchens 7-8
Laundry room 8-9
Non-residential
Offices - Business offices 6-8
Canteens 7-12
Conference rooms 8-12
Medical procedure offices 9-10
Copy rooms 10-12
Main computer rooms 10-14
Smoking area 13-15
Restaurants
Dining area 8-10
Food staging 10-12
Kitchens 14-60
Bars 15-20
Public places
Hallways 3-5
Waiting rooms 4-8
Banks 4-8
Hospital wards 6-8
Gymnasiums 6-10
Malls and retail stores 6-10
Lavatories 6-15
Classrooms 6-20
Foyers 8-10
Churches 8-12
Theatres and auditoriums 8-15
Restrooms 10-12
Swimming pools 10-15
Hospital facilities 10-20
Auditoriums 12-14
Smoking rooms 15-20
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