Have been reading for nearly two hours and can't seem to find my particular problem. We have a 12yr old Whitfield Quest insert - has been running constantly for 12 winters. Husband has replaced parts, cleans stove, taken good care of it etc. Today we notice that the air coming out of it smells like smoke - a VERY strong smell of smoke. But we SEE no smoke. No smoke from the T-clean out or back of the stove. In fact, you can't smell the smoke if you are looking behind the stove (not in the path of the air being blown out). He replaced the gasket tonight, because we read that sometimes that is the cause - no better. It's so bad that we've shut the stove off. The entire house smells - although the CO2 detector hasn't gone off (thankfully). This is a stove that never smelled - maybe slightly on start-up and shut-down. But this is a very strong odor. He's going to clean it well - but we're wondering if maybe there is a hole or some sort of compromise in the burn chamber - the tubes? Is 12yrs it for this stove? Anyone else with an old Whitfield have any words of wisdom? Sure would like to run it- it's 15 degrees here, and we've got 1.5 tons of pellets in the garage. Should be be taking off the firebrick and cleaning behind that? Is it compromised in some way if the firebrick is sort of burned away? (firebrick is orig to the stove) Any advice would be greatly appreciated. Thanks.