Make-up Air Units

Make-up air units (MAUs) are specially designed ventilation solutions that replace exhausted air with freshly conditioned outdoor air. When paired with other HVAC equipment, MAUs can improve energy efficiency, enhance indoor air quality, and support overall system performance.

At NorthStock, we carry a wide selection of commercial and industrial make-up air units from trusted brands like FloAire, King Electric, LB White, and Soler and Palau. Browse our models to find the right fit for your application.

How Do Make-Up Air Units Work?

Make-up air units (MAUs) play a critical role in ventilation by replacing exhausted indoor air with freshly conditioned outdoor air while preventing negative building pressure. The process is simple: outside air is drawn in, filtered, heated, and then delivered back into the building through ducts. In doing so, MAUs replace air lost through exhaust fans, fume hoods, or industrial processes, while also maintaining balanced air pressure to prevent issues such as door slamming or backdrafting. 

Who Benefits From Commercial Make-Up Air Units?

Many commercial and industrial spaces rely on HVAC MAUs to maintain healthy and balanced ventilation. Medical facilities and hospitals use them to provide critical air replacement, while commercial kitchens depend on MAUs to balance hood exhaust. Parking garages use them to dilute carbon monoxide emissions, and industrial environments—like welding shops and laboratories—rely on MAUs to prevent fume backdrafting. Large retail stores, event venues, and other high-occupancy spaces also benefit from improved indoor air quality and comfort. Beyond performance, make-up air units help businesses meet ventilation and safety code requirements across a wide range of applications. 

Commercial Make-Up Air Units From NorthStock 

NorthStock offers a wide selection of high-performance commercial make-up air units designed for both indoor and outdoor use. Choose from multiple heating options—including electric, natural gas, and propane—with ductable and non-ductable models available in a wide range of heating capacities. Contact us today for HVAC make-up air units and other cooling or heating solutions.

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