Bathroom exhaust requirements in modern airtight homes should differentiate between shower exhaust (requiring more ventilation due to moisture generation) and toilet exhaust (requiring less), rather than applying the same CFM requirement to both as some industry standards suggest.
normativepending
Speaker
Unidentified Speaker — Home Pressure Effects of Unbalanced ERV, Ventilating Dehumi… [7nhXP3v5Zy0]Evidence Quote
“if you hear Zender talk about it they're talking about 20 CFM from either a toilet or a shower and I think that it's strange to treat both of those things the same way [3:10]”
Source
Home Pressure Effects of Unbalanced ERV, Ventilating Dehumidifier, or Supply-Only Ventilation— Home PerformanceCreated: 8/13/2026, 3:25:18 AM
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