Fans have all aluminum improved leakage performance shutters.

These easy-to-install, highly efficient exhaust fans have all aluminum improved leakage performance shutters, making them ideal for use in ventilating retail stores, offices, factories, work shops, garages and farm buildings. They are shipped fully assembled with 115 Volt totally enclosed motors and OSHA-compliant polyester powder-coated wire guards. UL and C-UL Listed

Fans have all aluminum improved leakage performance shutters.
Shutter Mount Fans