Ablüfter-Rechner — Formel
## Exhaust Fan Sizing
**CFM = Room Volume x ACH / 60**
The HVI (Home Ventilating Institute) recommends a simpler rule for bathrooms: 1 CFM per square foot for rooms up to 100 sq ft, and 50 CFM minimum. For larger bathrooms, add 50 CFM per fixture (toilet, shower, tub). Kitchens need 100-400 CFM depending on cooking.
**CFM = Room Volume x ACH / 60**
The HVI (Home Ventilating Institute) recommends a simpler rule for bathrooms: 1 CFM per square foot for rooms up to 100 sq ft, and 50 CFM minimum. For larger bathrooms, add 50 CFM per fixture (toilet, shower, tub). Kitchens need 100-400 CFM depending on cooking.
Lösungsbeispiel
10 x 8 ft bathroom, 8 ft ceiling, 8 ACH.
- Volume = 10 x 8 x 8 = 640 cu ft
- CFM = 640 x 8 / 60 = 85 CFM
- Square foot rule = 80 CFM
- Use at least an 80-90 CFM fan.