Flue Sealers
Even brand-new dampers may not close tightly. Dampers can become
warped after the first hot fire. They may even be installed incorrectly to begin with. There are products commercially available
to temporarily seal off the flue and stop air from escaping up the chimney. One product is an inflatable stopper that you
insert into the flue. Most models are made of heavy plastic with an attached tube for inflating the device. The tube hangs
down into the fireplace to remind you that the stopper is there. The flue must be totally cool before installing the stopper.
Most manufacturers recommend cleaning the flue before inserting the stopper to ensure a tight and effective seal. This also
minimizes the amount of soot that will fall out of the flue when you remove the stopper. Stoppers cost $50. Depending on how
often you use them and your climate, they may pay for themselves within a few years.
