Breckwell Pellet Furnace Exhaust Blower (SP8500 Multi-Fuel). The exhaust blower is responsible for drawingsmoke out of the unit andpullingcombustion air into the furnace. It is important that the blower functions properly. If the blower is not running as it should,smoke/flue gas mayenter the room. You may also notice alazy flameand apoor burnas a result of inadequate combustion air being delivered to the fire.