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Tech Services

Mixed Air Temperature, MAT->POA

If you need to set the fresh air damper on a rooftop system and you know the percentage you need to satisfy the requirement the Outdoor Air Percentage calculator can be used. By inserting the Return Air Temp ex 70 the Outside Air Temp ex 95 and the current Mixed Air Temperature entering the Evaporator coil ex 72.3 then the percentage of Outdoor Air can be calculated to be approx. 10.1%By opening and closing the outdoor air damper you will change the Mixed Air Temperature thus changing the Outdoor Air Percentage to what you may require. Patience is key with this calculator.

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Enter at least 2 values, then click Calculate.