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What accounts for “make up air” into a room?

April 26, 2017accounts make up air room

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What accounts for “make up air” into a room?

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Make up air is the air needed to replace air being exhausted by the fan. Inadequate make up air will result in poor performance of the product. For a bathroom installation, make up air is generally provided by a gap at the bottom of the bathroom door. A 1/2″ gap between the bottom of the door and the floor or carpet is sufficient for most installations. Large CFM fans may require additional make up air.