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