AS50 Air King Exhaust Fan, 50 cfm, 48 W, White (FAN ONLY) | White polymeric grill. One-piece polymeric wheel. Plastic collar for 3 in duct connection, comes complete with built-in non-metallic back draft damper for quiet operation. Rated for ceilings insulated to R-40. UL listed for installation over a tub or shower on a GFCI circuit. HVI2100 certified. Grill dimension of 10 x 9-1/2 in. Housing dimension of 7-1/4 x 7-1/4 x 3-3/4 in.