One of our pellet stoves is an englander the 1500 sq ft model and the last week we have noticed a slight smoke smell when that stove is running. You put your head behind the stove and up the venting and you can smell the smoke smell but we have sealed and sealed every possible thing we can think of and it still smells. We have gone through a whole thing of fireplace sealer that you use a caulk gun to apply. I can't figure out where it's coming from. Any help? I have moved the carbon monoxide detector closer and that is fine, it's just an annoying smoke smell and it's driving me nuts.