Make Up Air is an exchange of old stale air for fresh outside air. Most data centers rely on a building air handler to provide make-up air. This air handler is usually shared with adjacent rooms of the building. It also maintains positive air pressure in the data center. Make sure that the thermostat for this air source is located in a cold aisle of the data center and set accordingly.
A more efficient option is to have a data center dedicated Make up Air Handler provide the make up air. A dedicated MAH is also a great source for data center humidification and conditions 100% of the outside air entering the data center to its stringent requirements. Be sure to place the supply vents over the cold aisle and position the return so that it pulls air from the hot aisle.
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