Under normal (non-pandemic) residential conditions without active pollution sources, 0.5 air cleanings per hour via filtration is a comfortable minimum target.
factualpending
Speaker
JeffEvidence Quote
“I'm comfortable going down to a number like a half air change per hour uh if the risk is such but um you know if you have a source going on in the space cooking something else going on in the space then you want a bigger number”
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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