An OUTDOOR AIR SUPPLY is air brought into a building from the outdoors (often through the ventilation system) that has not been previously circulated through the system. Also known as "Make-Up Air."
Other /More definition:
An OUTDOOR AIR SUPPLY is air brought into a building from the outdoors (often through the ventilation system) that has not been previously circulated through the system. Also known as "Make-Up Air."

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