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Every exhaust fan has a Cubic Feet per Minute (CFM) rating which shows how much air the vent can move. To be the most effective, the CFM rating of the exhaust fan should be at least half of the cubic footage of the bathroom it will be operating in.
Bathroom ventilation can operate intermittently at a minimum of 50 cfm or continuously at a minimum of 20 cfm, the same as 62. Bath fans must meet the design airflow either through on airflow either through on site testing or using their certified rated flow at 0.25â water column.