Air Changes per Hour (ACH) Calculator
Instantly determine the ventilation rate of your room. Enter the airflow rate and room dimensions to calculate the Air Changes per Hour (ACH).
Enter Room and Airflow Details
Provide the details below to calculate the ACH.
What is ACH?
ACH stands for Air Changes per Hour. It measures how many times the air in a defined space is completely replaced per hour. A higher ACH indicates better ventilation.
How to Use
- Enter Airflow: Input the airflow rate of your fan or HVAC system in Cubic Feet per Minute (CFM).
- Enter Dimensions: Input the length, width, and height of your room in feet.
- Calculate: Click the "Calculate" button to see the ACH value.