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  1. #1
    Join Date
    Nov 2005
    Location
    Hollister, CA
    Posts
    30
    I'm adding a catwalk to my attic and opening up a small door between two portions of the attic. I also have a pull-down stair which decreases the width of opening up to the attic. Is there a standard residential furnace width that i need to prep for? I can temporarily remove the pull-down stair to get a full 22.5", but I understand that technically I would not be able to put the stair back in following furnace installation since the code requires an access big enough for a furnace. I've heard that there are narrow furnaces (17 or so inches), but would this limit the selection available to my HVAC contractor?

    Rick T

  2. #2
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,723
    what size(BTU) furnace and how many ton blower????

  3. #3
    Join Date
    Sep 2004
    Location
    Memphis
    Posts
    2,502
    I doubt your gonna need a furnace thats wider than 22.5 inches. The only ones that would even be that wide are the 5 ton 125,000 btu furnaces. & thats an awful lot of heat.
    Life is like a jar of jalapenos. What you do today might burn your ass tomorrow.

  4. #4
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,271

    Thumbs up What's good going IN is good coming Out

    Originally posted by rdtompki
    I also have a pull-down stair which decreases the width of opening up to the attic.

    I can temporarily remove the pull-down stair to get a full 22.5", but I understand that technically I would not be able to put the stair back in following furnace installation since the code requires an access big enough for a furnace. Rick T
    21" is fairly standard and
    so is
    Temp Removal of pull-down stair.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  5. #5
    Join Date
    Nov 2005
    Location
    Hollister, CA
    Posts
    30
    BTW, my heat load calculation is only 30K BTU (mild climate of San Jose, CA). The two stage furnace will perhaps be in the 64K range, but everyone is selling 100K.


    Rick T.

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,723
    should be plenty of 70,000 btu furnaces that will go up the steps. lennox b cabinet 17 1/2" wide

  7. #7
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    American Standard, 14.5" wide x 28" deep I do beleive. Also a lot of units are even smaller than this, Ducane comes to mind. Believe it is 13.5" or even a 50,000 btu Heil or Tempstar they are in the 14.5" range.
    "Go big or Go Home"

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Need to know what size AC is required so a furnace with the correct size blower can be selected.

    AS/Trane go up to 80k BTUH with a 4 ton blower in a 2 stage furnace that is 17.5" wide.
    They have 60k and 80k furnaces with a 3 ton varriable speed blower in a furnace that is 17.5" wide.
    If more government is the answer, then it's a really stupid question.

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,875
    York/Luxaire has both 14 1/2" and 17 1/2" wide.

    You should have plenty of brands to select from with your heat requirements.
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  10. #10
    Join Date
    Nov 2005
    Location
    Hollister, CA
    Posts
    30
    Thanks for the very informative repsonses. I'll have an easy 17.5" width pass-through available without taking the stairs out. If there is a reason to go with a wider furnace it's easy enough to remove the stairs. Regarding blower size for AC - you really don't need AC in my part of California. We might get two hot weeks a year with upper 90's, but the humidity is low and it almost always cools down at night. Last year I put in a whole house fan and that, combined with a lot of ridge vent, does a great job of cooling the house down in the evening.

    Rick T

  11. #11
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    American Standard
    AUD-60-80-100 40"x17 1/2"x28"

    2.0 blower
    3.0 blower
    4.0 blower

  12. #12
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,933
    There is no reason to install an oversized furnace. I cannot think of one brand that is over 17.5" up to 75,000 Btu input rating.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  13. #13
    Originally posted by RoBoTeq
    There is no reason to install an oversized furnace. I cannot think of one brand that is over 17.5" up to 75,000 Btu input rating.
    ICP 92% (which is the H series) is 19 1/8" Wide or better.

    Would have to downgrade to (the N series) 90% N9MP*075B12B which is 15 1/2" wide.

    Or for his heat requirements a 90% N9MP*050B12B which is also 15 1/2" wide.

    ** All being 40" high and 29" deep.

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