[HayZee518]

because the M41 is a totally vented system you should not smell any kerosene exhaust. the damper solenoid is located inside the combustion blower shroud. you'll need to remove the shroud and take apart the blower to get at it. the only o ring in it is around the wires which come out of the fan motor and damper solenoid. the are no o rings on the damper. the damper is a plastic flap that opens and closes when air is needed. there are two o rings in the exhaust line - one at the outside house connection tee and one inside the unit where the offset tube goes. there are gaskets at the combustion pot top, front, view port front and first exhaust fin. also on the combustion pot bottom minus an area where the combustion air elbow connects.