I have an Econoburn 150 in my basement. I recently replaced the door gasket on the upper door. During operation there is no smoke leaking from the door seal. However, after operating for a while a smell fills the basement and then permeates into the house. This must be due to a leak. I put my nose near the seal of the upper chamber andI think that is where it is coming from. Tightneing the doors bolts has not helped reduce the smell. Has anyone had this issue and been able to solve it? I am thinking of redoing the seal again. Maybe I insalled the seal incorrectly.