Help, pouring foundation and need to prep vent

Discussion in 'Boiler Forum' started by JFCarbonneau, May 24, 2010.

  1. JFCarbonneau

    JFCarbonneau New Member

    Messages:
    7
    Location:
    NH
    We are pouring our foundation walls on this Friday, May 28th and I need to know how to prep the pass-through in the concrete wall for a propane direct-vent Triangle Tube Prestige Excellence PE110 condensing boiler?
    Or can it be vented through the rim board between two joists?

    Thanks in advance,

    JF
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    New England
    The vent line on a condensing boiler needs to slope back to the boiler so the condensate can be collected and drained away. It depends on how high that is where it needs to exit the house. You also want it to be above the minimum from the ground and within the limits of the manufacturer's recommended spacing from windows, doors, etc. So, the actual height it exits will depend on both the height of the installation and the distance from the wall so you maintain at least the minimum slope. It's not a real big deal to use a coring drill to make a hole later, if you prefer. It can go through the rim joist I think as well.
  3. 3m

    3m New Member

    Messages:
    76
    Location:
    NY
    If you know the height that is needed for the vent install a pipe 2 times bigger then the vent pipe then you can get your slope and seal it after its installed.
  4. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    If you live somewhere that gets a fair amount of snow every year you'll probably find local code states you need to have the vent atleast 2' above finished grade outside.

    If you plan the positioning of the boiler well downstairs with your upstairs floor plan you can bring the vent up inside a wall and then have it exit outside of the house. Just make sure there are no windows close by (usually within 3' in all direactions).

    However if for w/e reason you're still about 2' above grade when you exit the top of the foundation all you need to simply do is "can" the foundation wall. It's called canning because litteraly people use cans (coffee cans quite often!!) to leave holes in the concrete. So all you'd need to do is measure the size of the venting, which is probably around 5.5-6" in diameter, and can the foundation with something large enough to encompase the vent plus a little wiggle room for slope. Condensing boilers usually require 1/4" per foot on horizontal runs.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    New England
    Note, there are two common ways to terminate the vent: with a concentric external vent, or a duplex. The concentric converts the intake and the exhaust into a single penetration. Otherwise, you need two separate penetrations, and they must be at specific orientations and dimmensions for the external vent assembly to fit. So, you really need to determine what you are going to use and its installation requirements before you worry about it. If going through the foundation will meet the installation requirements, a core drill or even a star drill will make the hole(s) required fairly quickly. Some hydraulic cement, an dyou're done.
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