Commercial Products  >  Fans & Ventilators
Box Fan

The BEFx is a multi-use, high performing, variable volume centrifugal exhaust box fan designed for indoor and outdoor installation. Can be used for special exhaust or exhaust of lint-laden air or to supply make-up air and combustion air. Suitable for bathroom, kitchen or clothes dryer exhaust in a multi-story apartment building. 

It is the market's ONLY variable-volume AMCA FEI Certified centrifugal fan with a capacity of more than 6,000 CFM (up to 28,000 CFM).

The BEFx box fan has a scroll-free housing design with inlet outlet connections on the same centerline. The design of the inlet and discharge areas assure minimum lint build-up, while the housing's double-wall design completely insulates against fire, noise, condensation and heat with 2" fiberglass insulation.

The motor and impeller are mounted on a multi-position hinged door to provide easy access for service and cleaning. The box fan can be oriented in multiple positions, curb-mountable, inline, standing on a flat surface or suspended from a ceiling.

Includes the EDrive E3 Motor Controller - a full featured, industrial-type motor controller for indoor/outdoor use (NEMA 4X) and programmed specifically to control and adjust the speed of a BEFx.


  • Electro-commutated motor for optimal performance and efficiency (EDrive included)
  • Meets US Department of Energy 2016 Motor Efficiency Requirements
  • Meets ANSI/ASHRAE/IES 90.1-2016 Energy Standard for Buildings Except Low-Rise Residential Buildings
  • Capacities of 250 to 28,000 CFM (425 to 48,000 m3/h)
  • Insulated aluzink steel housing & aluminum impeller
  • Backward-curved high-efficiency impeller
  • Temperatures up to 400°F/200°C
  • Extremely low noise level 
  • Certified for indoor and outdoor installation
  • NEMA 4X rated EDrive E3 Motor Controller
  • Complete fan/control package from a single manufacturer
  • Low operating costs


Capacities 0-32,000 CFM (0-54,000 m3/h)
Material    Galv. Steel Housing and Aluminum Impeller
Drive Backward-curved Impeller
Motor EC-Motor, TEFC, Class H w/insulated rotor/shaft grounding system
Motor Control EDrive E3 MSC Controller (NEMA 4X)
Max. Temp 400°F (200°C)
Warranty 2-Year Factory Warranty
Listings UL 705 Standard for Power Ventilators with special consideration for venting lint-laden air from single or multiple dryers.
CSA C22.2 No. 113-12 Fans and Ventilators, Edition 9
Certifications ANSI/AMCA standard 211 and AMCA Standard 301 for Sound and Air Performance and FEI Fan Energy Index.

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BEFx Box Fan—variable-volume centrifugal exhaust box fan with a capacity of more than 6,000 CFM
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