When outdoor air pollution is present (e.g., near a highway) or indoor sources are active, air cleaning targets should be increased above baseline; outdoor air intake fraction can be reduced to lower total incoming pollutant load.
causalpending
Speaker
JeffEvidence Quote
“if you have some incident going on in outdoor or maybe you live near a highway and there's outdoor air pollution then you know it's appropriate to go to a lower number on the outdoor air”
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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