Make-up air units are designed to supply fresh, tempered air into a building to replace exhausted air and maintain balanced indoor pressure. Commonly used in commercial kitchens, industrial facilities, and large commercial spaces, these systems help improve air quality, enhance ventilation, and support energy-efficient HVAC performance. By delivering clean outdoor air directly into the space, make-up air units help prevent drafts, reduce negative pressure, and create a more comfortable environment for occupants. Their reliable design, easy integration with exhaust systems, washabale aluminum filters and low-maintenance operation make them an essential component of modern ventilation solutions.

Belt Driven Units – CRBC, CUB & CWB – utilizes a unique bearing/shaft arrangement that has been designated the “C-Drive”. This type of drive uses a captured bearing arrangement inside a cast aluminum disc assembly locked to a short, large diameter shaft. The shaft is held stationary and the centrifugal wheel/disc assembly rotates on the shaft instead of the entire assembly rotating.
This compact drive assembly provides more room in the motor compartment area and the single bolt, V-belt adjustment makes for a very serviceable unit.

Downblast exhaust fans are designed to provide efficient and reliable ventilation for commercial, industrial, and institutional buildings. With a durable construction and weather-resistant design, these downblast exhaust fans deliver dependable performance, quiet operation, and easy maintenance—making them an ideal solution for year-round ventilation needs. Available in both belt and direct drive configurations. Type CRBC is equipped with a C-Drive Assembly. All CRB and CRF models can be specified with optional High Wind Construction.