Free Air Changes Calculator
Calculate the required ventilation airflow rate from room volume and air changes per hour.
m
m
m
ACH
Required Airflow
1,080 m^3/h
Room Volume180.0 m^3
Required Airflow300.0 L/s
Required Airflow vs Room Length
Air Changes per Hour (ACH)
ACH defines how many times the entire room volume of air is replaced per hour.
Formula
Airflow = Room Volume x ACH
Required ACH depends on the room function. Adequate ventilation controls temperature, humidity, odours, and airborne contaminants.
Example Calculation
A 10m x 6m x 3m room requiring 6 air changes per hour.
- 01Volume = 10 x 6 x 3 = 180 m^3
- 02Airflow = 180 x 6 = 1080 m^3/h
- 03Airflow = 1080 / 3.6 = 300 L/s
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