Dayton corrosion resistant shutter mount exhaust fans pull out odour, moisture and fumes from inside to outside of a vent in commercial and industrial applications. These fans have a shutter for cutting off external ventilation when not operating or required. They have fibreglass frames with steel guards, epoxy coated wire guards & 4 / 8 bladed fibreglass reinforced polypropylene propellers for corrosion resistance, durability & preventing entry of unwanted items inside the fans. These fans feature direct driven motors that are directly connected to the fan through shafts or axles for increasing energy efficiency and class B insulated, enclosed air-over motor enclosures for withstanding temperatures up to 104 degrees F. They also feature automatic thermal protection to start or stop the fan operation according to permissible ambient temperatures for protecting the fan motors. Choose from a wide range of these exhaust fans, available in motor power outputs ranging from 1/20 to 1/2 hp.