Air King AK917 4in Duct 70 CFM Ventilation Fan 3.5 Sones

One piece polymeric blower wheel. White polymeric grill. Dimensions: 10" x 10". One - 250 watt maximum type R40 bulb medium base infrared lamp to deliver silent heat to the room bulb not included. Rated type IC for ceilings insulated to R-40. Plasticcollar for 4" duct connection comes complete with built in non-metallic back draft damper for quiet operation. UL listed. HVI2100 certified.null BATH FANS ONE BULB - INFRARED FAN/HEAT LAMP COMBO CFM=70 Sones=3.5

Air King AK917 4in Duct 70 CFM Ventilation Fan 3.5 Sones Infrared heat lamp for efficient warmth Fan and heat lamp combo for versatile use CFM rating of 70 for effective air movement Sones rating of 3.5 for quiet operation Experience efficient heating and ventilation with this innovative fan and heat lamp combo