One piece polymeric blower wheel White polymeric grill Dimensions: 16-1/2 x 10 Two - 250 watt maximum type R40 bulb medium base infrared lamp to deliver silent heat to the room and is rated type IC for ceilings insulated to R-40 bulb (not included ) Plastic collar for 4 duct connection comes complete with built in non-metallic back draft damper for quiet operation. CFM=70 Sones=3.5 UL listed.