This calculator computes the air changes per hour (ACH) for a given room by analyzing three key input parameters: room volume, ceiling height, and ventilation airflow rate. The function leverages standard indoor air quality calculations to determine the frequency of complete air replacement within an enclosed space.
ACH Calculator
Enter the floor area of the room.
Air Changes Per Hour (ACH): –
Time to Clean Air Once: –
Air Changes Per Hour (ACH) is a measurement used in indoor air quality management to indicate how many times the air within a defined space is changed/moved through the filter media (usually an air purifier’s filter).
| Condition | Required minimum Air Changes per Hour (ACH) |
|---|---|
| Normal Conditions | 2 |
| AHAM standard (recommended for many conditions) | 4.8 |
| Smoke or VOCs | 8 |
