True Makeup Air Systems
Anything else is cheating the Code
The true Makeup Air System (MUAS) is powered. It is triggered when the compensated exhaust system is energized. The supply air damper opens and the MUAS fan is powered on. The fan is speed-controlled relative to the speed of the compensated exhaust system's fan speed. In otherwords, as you speed up the exhaust fan, the MUAS fan speeds up too, and vice versa.
Learn more about Makeup Air Systems in Solutions.