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EERE » BTO » Building America » Solution Center Home » 8.2 Bathroom system exhausts directly outdoors and has a continuous rate ≥ 20 CFM (Recommended ≤ 1 sone) or an intermittent rate ≥ 50 CFM (Recommended ≤ 3 sones)

8.2 Bathroom system exhausts directly outdoors and has a continuous rate ≥ 20 CFM (Recommended ≤ 1 sone) or an intermittent rate ≥ 50 CFM (Recommended ≤ 3 sones)

The following Solution Center guides provide specific guidance about intermittent and continuous bathroom fans:

Intermittent Supply/Exhaust Fan Ratings
Continuous Supply/Exhaust Fan Ratings