What are Make Up Air Units?


Processes that exhaust air remove good air from the building.


Make Up Air Units replace this exhausted air with fresh, clean air.


Make-up air units can provide heat in the winter or air conditioning in the Summer for employee comfort.
Make up air units are the best for commercial kitchens, industrial settings, manufacturing spaces, warehouses, public works buildings and anywhere where air is being pressurized, temperature and humidity levels need stabilizing or any situation that requires air exchange and treatment ventilation under pressure.








Gas & Propane MUA units boast intermittent spark ignition systems with timed safety lockout and redundant valves. They are made from stainless steel, utilizing aluminum gas supply sections with non-clogging combustion baffles. All models meet the highest American National Standard/CSA Standards for Gas unit heaters and Gas fired duct furnaces. MUA units are ETL listed- including their Safety Control Boards. Both Gas and Propane models are 3 phase, 208 volt. In addition, they feature Commercial smoke detection Interlocks.


Make up air units will manage and monitor building pressure, air quality, and temperatures. They will defeat dangerous carbon monoxide build up and by-product backdraft. They will also assure worker health & safety, maintain air code compliance, reduce heat, reduce air costs, improve exhaust, address indoor pollution and eliminate process odors


HVACDIRECT.COM knows the HVAC industry inside & out. We know that commercial and industrial air treatment is complex, costly, and vitally important to each facility. We learned to select our products accordingly. Our customers’ needs and requirements are always at the forefront of our minds. We can quickly and easily meet your needs. If you need assistance with selecting the best system for you, please give us a call or fill out the online form.


We provide flexible and highly reliable make-up air units for various industries. We have assisted engineers, installers, contractors, HVAC suppliers, building supervisors, etc. Our products are used in a vast array of commercial and industrial applications. We are ready to configure a high-performance MUA unit to fit your needs.