Pieces/parts for Utility room combustion air vents

Discussion in 'HVAC Heating & Cooling' started by rfsmith48, Sep 3, 2014.

  1. rfsmith48

    rfsmith48 Member

    Joined:
    Feb 23, 2008
    Location:
    Colorado
    Hi,

    We are about to replace a 40 year old gas furnace with new furnace and AC units.

    Because the house as been sealed up and insulated well over the past 10 years, we will need to add combustion air vents, high and low, to the utility room.

    Can someone direct me to vendor of wall flanges/vents for the exterior? Tips on any other parts would be great. I am planning on using the floor joist space for the ducting.

    Any tips or guidelines for this sort of project is appreciated.

    Thanks,

    Rog Smith
     
  2. Dana

    Dana In the trades

    Joined:
    Jan 14, 2009
    Location:
    01609
    It's generally better to go with direct vented sealed-combustion heating units and simply forget about the makeup air issue.

    Combustion air vents are a solution- problem, raising the air leakage & heat load of you house that you took all those pains to air seal.
     
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  4. rfsmith48

    rfsmith48 Member

    Joined:
    Feb 23, 2008
    Location:
    Colorado
    Thanks Dana,

    The problem is the that the house and the energy savings do not justify anything over an 80% furnace.

    Rog
     
  5. Dana

    Dana In the trades

    Joined:
    Jan 14, 2009
    Location:
    01609
    The house and net present-value on future energy savings may not warrant a better furnace, but your health might, assuming you plan to live there. Poking big holes in the house to prevent backdrafting isn't necessarily great for indoor air quality.
     

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