Furnace exhaust pipe sealing. Should have pipes made from masonry or metal and in similar fashion be sealed with aluminum flashing and high-temperature silicon caulking. They sealed around the pvc pipes outside with silicone. When applied to a cooled-down pipe. Cut the tip of a caulk tube with a utility knife. Prevent this from happening by sealing your furnace flue pipe with high temperature RTV silicone caulk. The opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic. If you are sealing a gap around the heat exchanger use a high. Its a 2 stage furnace and the installers put in 2 pvc pipes that go directly outdoors.
There was lots of extra blue sealant on the lower edge also. A conventional furnace should exhaust the hot gases of combustion through the roof vent above your home. Sheetmetal flue pipes on the other hand carry combustion gases. Through these gaps if left unsealed combustion gases may leak into your home and build up to unhealthy levels. Heat will seal the tape to the metal pipe as the temperature climbs. Should have pipes made from masonry or metal and in similar fashion be sealed with aluminum flashing and high-temperature silicon caulking. Furnace Flues Require Special Sealing Techniques.
Some building inspectors discourage taping up furnace clothes dryer and water heater flue joints so check your local building codes before using this tape especially when selling your home. Press the nozzle of the foam sealant into the gap. Trane direct vent xv95. Since furnace exhaust vent pipes are a prime suspect for air leaks around the chases sealing around them before insulating can great reduce infiltration and wasted heat.