Use our free Air Changes per Hour (ACH) Calculator to determine how often the air in a space is replaced by fresh or conditioned air. This is crucial for maintaining excellent indoor air quality, ensuring proper ventilation, and meeting health and safety standards in homes, offices, or specialized environments. Improve comfort and wellbeing today!
Formula:
The Air Changes per Hour (ACH) is calculated using the formula:
ACH = (Total Airflow (CFM) × 60) / Room Volume (ft³)
Where:
- ACH is Air Changes per Hour, representing how many times the air in a space is theoretically replaced per hour.
- Total Airflow (CFM) is the total volume of air supplied to or exhausted from the room in Cubic Feet per Minute.
- Room Volume (ft³) is the cubic volume of the room, calculated as Length × Width × Height in cubic feet.