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insulating type B vent pipe
I have a 100K btuh hydronic boiler in my garage for baseboard type heating. The type B vent pipe runs horizontally across the garage for about 20 feet (2-45’s and 1-90) then goes vertically up about 25-30 feet to the roof. It was inspected upon installation, and I know it is just barely meets the code for horizontal to vertical ratio. The boiler vent hood it beginning rot from condensate. I assume the flue gases are condensing because of the vent pipe configuration. I believe that the two most obvious solutions are: (1) move the boiler closer to the vertical; (2) or install a power venter to assist the venting process. My question is: Can I insulate the horizontal run to maintain the internal temperature of the flue gases so that the “chimney effect” pulls the gases up to the roof before condensing takes place. Is there a safe product to do this? Would it even work?