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To calculate the required CFM for a room, you need to know the room's volume and the desired air changes per hour (ACH). The formula is:
CFM = (Room Volume in Cubic Feet × ACH) ÷ 60
Use the form above to input the room dimensions and ACH, and the calculator will provide the required CFM.
| Room | Recommended ACH |
|---|---|
| Living room | 3 – 4 |
| Bedroom | 5 – 6 |
| Kitchen | 7 – 8 |
| Bathroom | 7 – 8 |
| Laundry room | 8 – 9 |
| Attic (if cooling) | 12 – 15 |
| Garage (if used for work) | 20 – 30 |