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Wall furnace venting question

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  • Wall furnace venting question

    A gas-with-gas stove is being removed and a new stove being put in, and we'll lose the heater. There's a flue going from the heater part of the stove, to a chimney to the right of it. Thought about a wall furnace, but it would have to hang on the wall with that chimney right behind it. The wall furnace venting is supposed to go straight through the wall to the outside; how about if the pipe has to be longer, and go through the inside wall, the inside chimney wall, across the chimney space, through the outside wall of the chimney, and now be outside the house?

  • #2
    Re: Wall furnace venting question

    I'm assuming this is a direct vent furnace? Check with the manufacture, some make vent extensions or at the very least will tell you the max length you can run your pipe.

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    • #3
      Re: Wall furnace venting question

      Yes you should check the manual for the furnace you have in mind. It should tell you the diameter of the vent pipe and the possible ways to vent the furnace. Also there should be a max length specified and it is normal to take a certain number of feet away from this for each bend. For example they may say remove 5' from the total for each 90 degree bend. So if you have lots of bends the run could possibly be very small,

      Consult the manual, come up with the vent routing and see if it is feasible.

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      • #4
        Re: Wall furnace venting question

        they make recessed wall furnaces (mount inside a stud space) which you knock a hole out ontop to the exterior wall, they use BL venting (double wall stainless steel)

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        • #5
          Re: Wall furnace venting question

          A lot easier to relocate the unit so it does not go through the chimney and you can have a normal vent pipe run. There are actually intake and venting pipes with modern high efficiency or condensing furnaces and the intake needs to bring in clean air. I would be concerned about having the intake possible sucking in air from the chimney and you would have air leaks as well as effective caulking would be nearly impossible with a metal pipe that is subject to thermal contraction and expansion going through it.

          Time to step back and explore all the options before you invest a lot of time and money and talk to a couple of HVAC contractors and get their advice.

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