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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.
| 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 |