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  1. #1
    Join Date
    Oct 2005
    Location
    Omaha, NE
    Posts
    309

    New furnaces have to be same size as old furnaces???

    Hi,

    I just have a quick question on sheet metal work. I am looking into replacing our home's 16-year-old furnaces x2 (see below), to be replaced by my local HVAC Co.

    The questions are:

    1. Should I get furnaces (let's say brand XYZ) with similar openings as right now so there is less "messing around" with sheet metal work.

    2. Or any furnace can be made to fit into existing sheet metal openings???

    3. Do most furnaces have similar opening sizes on RETURN and UPFLOW Ouput portions?

    TIA

    cn
    Omaha NE
    House Built in 1991.
    * 1st Floor + Basement: 1991 TEMPSTAR Gas Furnace (5 burners ? 100K BTU)
    * 2nd Floor: 1991 TEMPSTAR Gas Furnace (4 burners ? 80K BTU)

    Tempstar Furnaces #: NUGI100DH03, L904166400
    Attached Images Attached Images  

  2. #2
    Join Date
    Oct 2004
    Location
    PDX
    Posts
    4,917
    Quote Originally Posted by cn View Post
    Hi,


    1. Should I get furnaces (let's say brand XYZ) with similar openings as right now so there is less "messing around" with sheet metal work.
    That sure makes it easier. Make sure that the existing furnace is the right size for the home to begin with. Your contractor should be able to do a heat load/loss calculations for you.

    2. Or any furnace can be made to fit into existing sheet metal openings???
    I can pretty much make any furnace fit with the use of transitional sheet metal fittings. Sometimes you have to modify the duct work, or re-do some of it to make it all work. It helps if you have a brake and a pitts in the install van. Hence why alot of companies use box vans... It's a shop on wheels.

    3. Do most furnaces have similar opening sizes on RETURN and UPFLOW Output portions?
    No, not always. Depends on the size of the furnace, and the existing duct work. See answer #2

  3. #3
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,761
    we have pittsburg machine and 4' brake in our install truck, anything we need to adapt is made at the job. with all of the new furnaces being shorter we always have to make something.

  4. #4
    Join Date
    Sep 2007
    Location
    Maryville Tennessee
    Posts
    92
    Any good Heating and Air company with a good sheet metal man and shop will be able to make fittings for the new furnace to match your duct openings.

  5. #5
    Join Date
    May 2005
    Location
    Western Kansas
    Posts
    267
    Personally, I stop in the job to be done before hand, take all my measurements and build it up at the shop. Makes for less downtime on the job and everything drops into place. I'm sure bigger companies don't have that luxury.

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