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Air Change Calculator for Facility Construction and Renovation

Determining the Number of Abatement HEPA-AIRE Units Needed

Room dimensions (in feet):

long x wide x high (to drop ceiling)
-or-
cubic feet

Select the number of air changes per hour (ACH) you would like to have for the room:

Select a safety margin that compensates for airflow losses such as duct leakage, filter loading, etc:
(The safety margin will be used in the calculations to determine the net ACH of the room)

Select the HEPA-AIRE model or the peak airflow rate needed for the room in cubic feet per hour: