How to Calculate Air Changes per Hour

There is a simple way to calculate the air changes required for any room. The calculation works two ways;

1) If you know the Cubic Volume of the room you can calculate the ACH (Air Changes per Hour)

2) If you know the CFM that has been specified for the room, you can determine how many air changes for the room.

Air changes are used by various codes to dictate a minimum amount of air that must be exchanged from a particular type of room. Hospital rooms require various air changes based on usage.

Bathrooms require a minimum amount of air changes, so knowing how to calculate the air changes required for a room is important. The amount of air changes will determine how much CFM is required to accomplish the calculated amount.

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