Ideal for greenhouses, livestock, swine and dairy barns, QC Supply’s DURAFAN 16" Select Speed Shutter Fan removes and controls condensation, excess heat and obnoxious fumes. Features a totally enclosed motor with built-in speed switches and a 9' cord. Includes a balanced aluminum blade, protected by a durable chrome-plated OSHA grill on the intake side. Its corrosion-resistant aluminum shutter comes complete with a tie bar to reduce shutter flapping and keep the shutters closed when the fan is not running. This fan is easy to install with no electrician required. Just mount the fan in the wall and plug it in.