CFM and Air Changes Calculator
Find the airflow (CFM) to hit a target number of air changes per hour in a room.
Estimate only. Required air changes come from code, specs, or a safety plan, not a rule of thumb. For dust, fumes, or confined spaces follow your safety program.
Result
Fill in your numbers and hit Calculate.
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How the math works
Volume (cu ft) = L x W x H
CFM = volume x air changes per hour / 60
Air changes per hour = CFM x 60 / volumeFree weekly email
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