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Choose a Bathroom Exhaust Fan in 6 Steps: Airflow, Noise and Ducting

A practical checklist for selecting the right fan size, sound rating and outdoor vent path.

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Home Ventilating Institute

Original Home Ventilating Institute guidance link; preview image not verified.

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A bathroom fan must exhaust moist air outdoors. HVI's CFM examples are North American selection guidance, not local building-code requirements.

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Measure bathroom floor area and ceiling height, then compare the fan airflow rating in CFM or m³/h.
HVI's North American reference is at least 50 CFM for small bathrooms and roughly 1 CFM per square foot from 50 to 100 square feet; verify local rules separately.
Compare sound ratings (sones or dB), power use and optional humidity sensors or timers; do not equate the two sound scales.
Confirm the exhaust duct leads outdoors, not into an attic, ceiling void or enclosed interior space.
Consider make-up air below the door and fan position near the shower; have a qualified professional handle wet-zone electrical work.
Check model documentation and local installation codes, then have a competent installer verify airflow and outdoor exhaust.