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Makeup Air handler (MAH) - A larger air handler that conditions 100% outside air. Synonymous with MAU.
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Makeup Air - The conditioned air delivered by a MAU or MAH.
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Makeup Air Unit (MAU) - A larger air handler that conditions 100% outside air. Synonymous with MAH.
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Maximum Temperature Rate of Change - An ASHRAE standard established to ensure stable air temperatures. The standard is 9 degrees F per hour.
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Minimum Efficiency Reporting Value (MERV) - ASHRAE 52.2, for air filtration measured in particulate size. Data Centers usually MERV 13.
