Skip to main content
    Pro Reference Trades Suite
    Sign InCreate accountAdminUpgrade
    All answers

    ASHRAE 62.2 Ventilation Calculator (Residential)

    How much whole-house ventilation does ASHRAE 62.2 require for a 2000 sq ft, 3-bedroom house?

    Using the ASHRAE 62.2-2019 formula Qtot = 0.03 x Afloor + 7.5 x (Nbr + 1), a 2000 sq ft, 3-bedroom home needs 0.03 x 2000 = 60 CFM from floor area plus 7.5 x 4 = 30 CFM from occupants, for 90 CFM of continuous airflow. That is the continuous whole-house rate before any local exhaust is added.

    Run the numbers for your project

    Use the ASHRAE 62.2 Ventilation Calculator (Residential) to get an exact answer for your inputs.

    Open the calculator

    Related questions

    Estimates and general guidance only. Verify against your local code and AHJ before any installation. Gas, electrical, and refrigerant work is hazardous to untrained users.

    Pro launch updates

    Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.