These commercial make-up air units help maintain good indoor air quality in commercial buildings, including medical facilities, apartments buildings, schools, and restaurants. They help keep a proper air balance pressure between rooms, so that you can keep odors in one area from reaching another.
Commercial make-up air units also help you meet ASHRAE mandated ventilation rates, and because they are direct-fired, 100% of the energy stays indoors. Make-up air units also help offset the negative pressure associated with buildings with exhaust systems.