High-impact polystyrene (plastic) constructionRust proof and scratch resistantUse as conventional register when closedUse as air deflector when openKnockout at each end for ceiling installation Product Description Installing this high-impact polystyrene floor/ceiling pop-up register and deflector is an easy DIY project that will improve comfort and energy efficiency while adding value to your home. Rust proof and scratch resistant Use as conventional register when closed Use as air deflector when opened. Knockout at each end for ceiling installation. 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.