Air Changes per Hour Calculator

The Air Changes per Hour Calculator determines how many times the air in the environment is replaced per hour. Considers room area, room height and airflow rate of the ventilation system. Ideal for sizing residential, commercial and industrial ventilation, ensuring indoor air quality, controlling humidity, eliminating pollutants and odors.

Updated at: 06/07/2025

ACH Calculation

Enter the environment data and ventilation system to calculate air changes per hour

metros quadrados (m²)
metros (m)
metros cúbicos por minuto (m³/min) ou CFM