This Canarm ventilation fan is most suitable for ventilation of barns, assembly halls, bakeries, factories, garages, warehouses, and other commercial and industrial buildings. An accurately balanced, sturdy fan. The blade provides smooth, vibration-free operation. This fan is shipped as a unit, completely assembled and ready for installation and features, Motor: totally enclosed, ball bearing, with thermal overload protection; Fan blade: heavy gauge aluminum, well balanced; Housing box: rugged steel welded construction with durable baked enamel finish; Motor mount: heavy welded steel rod; and Shutter: aluminum louvres supported by long life nylon bearings. Single speed control available HH #5245-500.