USSC Pellet Stove Combustion Blower (W/ Housing). The exhaust blower is responsible for drawing smoke out of the unit and pulling combustion air into the stove. 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.