How do you calculate ACH in HVAC?

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To calculate Air Changes Per Hour (ACH), find the CFM of your device and multiply that by 60 then divide that total by the total cubic feet of the room to get your total ACH. What is the formula to calculate ACH? The formula to calculate ACH is 60 multiplied by the cfm of your air exchange device, divided by the volume of air in the room.

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