Make up air units don’t need to be complicated for HVAC technicians to understand. Like anything, a solid base knowledge is needed to fully comprehend their function. Direct fired and indirect fired make up air units provide 100% outside air to building hallways, kitchens and warehouses to make up for lost air through exhaust systems and keep the building envelope balanced.
For more info on make up air units, check out this article https://www.hvacknowitall.com/blogs/blog/262289-non-condensables-in-a-refrigeration-circuit
and listen to this short podcast https://anchor.fm/hvacknowitall/episodes/Make-Up-Air-Units-A-Quick-Discussion-e7ml6d
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