Air King BFQ 90 Bath Fan, CFM White, polymeric grill measures 10" x 10", with durable high-impact plastic housing for quiet operation and enhanced performance Operates at 90 CFM at 2.5 sones Features a special snap-in installation system for easy in-ceiling installation Comes with 4" plastic duct collar with back draft damper for quiet operation and draft protection Can handle continuous operation, is rated for ceilings insulated to R-40, Culus-listed, HVI 2100-certified, and UL-listed for installation over a tub or shower on a GFCI circuit Easily installs using the included snap-in mounting system High performance ventilation at a budget friendly price Plastic housing is quiet and will not rust, perfect for areas near salt water or with high moisture Right or left hand ducting 1-Year parts only warranty