Grill is 13-1/2" diameter. Ribbed frosted glass light lens. 2 - 60 watt maximum, type A19, medium base bulbs, bulbs notincluded. One piece polymeric wheel. Plastic duct collar for 4" duct connection, comes complete with built in non-metallic back draft damper for quiet operation. Rated Type IC for ceilings insulated to R-40. UL Listed. HVI2100 Certified.