PRODUCT DESCRIPTION One-piece all-steel construction. 1/3" fins set at 20° angle. 7/8" margin turnback. Painted grilles have a durable powder-coat finish. FROM THE MANUFACTURER Imperial Manufacturing is a family-owned company that was founded in 1979. Viewed as a world class manufacturer of more than 7,000 heating, air conditioning, ventilation and building products for residential and light commercial applications, with manufacturing and warehouse space across North America. Imperial Manufacturing is acknowledged as an innovator in the design and production of indoor air quality equipment for the North American heating, ventilation and air conditioning industry.