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Air Change Rate Calculator

Adicot, Inc.'s Air Change Rate Calculator is a powerful tool for calculating the air changes per hour (ACH) in a room or building. Our calculator is easy to use and provides accurate results for a variety of applications. Whether you're an engineer, architect, or building owner, our calculator can help you determine the ventilation needs of your space.

Instructions: 

  1. Select English or SI Units

  2. Select Input Criteria - the calculator will solve for the other value. 

    • Air Flow Rate​

    • Air Change Rate

  3. Enter the room height

  4. Select how to enter the room area: 

    1. Enter the area directly​

    2. Enter the length and width of the room

  5. Click the Calculate button

  6. The results will be displayed in the results window

Methodology:

Q =  ACH x V / C   

ACH = Q / V x C

where: Q = Aif flow rate, CFM [l/s]

ACH= Air change rate, 1/hr

           V = Room Volume ft^3 [m^3]

           C= 60 min/hr [3.6 m^3 x sec /l/hr]

Air Change Rate
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