What Size Ventilation Fan for Bathroom? | The CFM Rule That Works

Bathroom exhaust fans are sized by CFM (cubic feet per minute), using a simple rule: 1 CFM per square foot for most bathrooms, with a 50 CFM minimum and fixture-based sizing above 100 sq ft. Sizing a bathroom ventilation fan isn’t about guessing—it’s a straightforward airflow calculation that stops mold, mildew, and fogged mirrors before

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