Historical ventilation controller systems from the 1980s-90s had the capability for user adjustment, but users were confused by the interface design rather than the concept of adjustable fresh air intake.
factualpending
Speaker
JeffEvidence Quote
“there were ventilation controllers that people could turn up or down depending on how much fresh air they wanted and the issue wasn't people knowing whether they wanted fresh air or not the issue was people being confused by the controller”
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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