The Twister Series heavy duty 18 gauge butterfly damper opens easily when the fan turns on, but springs closed when not operating for a good weather seal. The variable speed, high efficiency motors can be used for commercial, industrial, farm, poultry, hog, greenhouse and hobby shops. The OSHA approved grill is hinged and designed for safety and easy maintenance. Optional weather hoods available for added wind and weather protecton.

Control Flow VENTILATING FANS Help to:

• Distribute fresh air throughout building.
• Control wide temperature ranges.
• Remove and control humidity and condensation.
• Exhaust obnoxious fumes and smells.
• Improve air quality.

FEATURES:

MOTOR - Totally enclosed, amintenance free, direct dirve high efficiency motors have completely sealee ball bearings, UL and ULC certification, built in automaticthermal overload protection, covered by a FULL TWO YEAR WARRANTY.
BLADE - The fan blade is constructed of aluminum with a zinc plated steel hub balanced for smooth vibration-free operation. Pitch is designed to correlate with motor horsepower to deliver maximum efficiency.
HINGED GRILL - Allows easy blade cleaning and maintenance by simply removing two bolts and swinging out the fan assembly.
SHUTTER - The 18 gauge galvanized steel butterfly shutter has adjustable, positive draft-free closure. It opens up fully for maximum CFM output. Easy accessibility for maintenance permits quick and easy removal of dirt build up.
HOUSING - Heavy 18 gauge (.047") tunnel design has a large venturi for maximum efficiency and air flow. Constructed of long-life galvanized steel.
GUARD - Attractive heavy-duty combination motor mounted/safety guard with bright easy-to-clean zinc-chromate finish. Conforms to OSHA safety requirements.