Make Up Air Units (MAU)

A Make-Up Air Unit (MAU) is an HVAC system designed to introduce fresh, conditioned outdoor air into a building to replace air that has been exhausted by process fans or ventilation systems. This is especially important in environments where the removed air cannot be recirculated due to contamination or specific ventilation requirements. By supplying clean air at a controlled temperature and humidity level, MUAUs help stabilize indoor pressure, improve air quality, and support the health and comfort of building occupants.

The primary purpose of make-up air systems is to achieve and maintain optimal Indoor Air Quality (IAQ). In commercial and industrial settings—such as kitchens, laboratories, and manufacturing facilities—these systems are essential for removing airborne contaminants, regulating temperature, and maintaining pressure balance. Compared to conventional exhaust fans, MUAUs offer a more effective and energy-efficient solution for ensuring a safe and comfortable indoor environment, especially in buildings where ventilation demand is high.