One piece polymeric wheel. White polymeric grill. Dimensions: 11 in x 10-1/2 in High impact polycarbonate lens. 100 watt maximum, type A19, medium base bulb, (not included). Rated Type IC for ceilings insulated to R-40. Plastic collar for 4 in duct connection, comes complete with built in non-metallic back draft damper for quiet operation. UL listed. HVI2100 certified. Fan and light can be wired to operate separately.