The practical formula for baseline home ventilation is: (square footage × ceiling height ÷ 60) × [0.5 to 5-6], where the multiplier is adjusted based on risk factors like occupancy, pollution sources, and outdoor air quality.
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“take your your square footage multiply by your ceiling height divide that by 60 that's your air cleaning one time per hour and then use what Jeff is telling us which is half to five or six be able to turn it up and down based on what you know and monitor”
Source
Home Ventilation Advice from HVAC Researcher Jeffrey Siegel: How Many CFM is Ideal?— Home PerformanceCreated: 8/13/2026, 4:55:15 AM
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