Optimal home ventilation strategy for families spending time in a single room is one central system at low filtration (0.5 ACH) plus one portable HEPA unit in the occupied room, rather than high central system capacity.
normativepending
Speaker
HostEvidence Quote
“probably just one HEPA portable unit that's less a good filtration system for your house to say Merc 13 or something like that with the ability to run between half an air cleaning per hour”
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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