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  1. #14
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    8,316
    Post Likes
    Have you got the height for radiant tube heaters? They can be direct vented so no inside air, no filters needed.

  2. #15
    Join Date
    Jun 2011
    Location
    NE Ohio
    Posts
    2,739
    Post Likes
    whether it is a natural draft, or a condensing furnace ( 90 % ), or a mid efficiency furnace ( 80 % ) you are still going to have to filter the air prior to the air being drawn into the blower assembly or the blower assembly, blower wheel, and blower motor will become covered with dirt / dust

    also, dirty air will also be drawn into ribbon burners the same as in shot burners, unless your combustion air is being drawn from outside ( 2 pipe condensing furnace )

    so I would consider those two points as being somewhat equal .....

    so why not a new mid efficiency furnace ( 80 % ), possibly with a combustion air pipe from the outside located close to the burners ? there is no secondary heat exchanger to become plugged, on the outside

    of course you would have to pay close attention to the air filter, a newer furnace will probably be more likely to trip on limit with a dirty air filter than an older furnace

    natural draft furnace heat exchangers can plug on the inside quite easily also when located a dirty environment
    Last edited by hvacskills; 01-14-2019 at 11:28 PM.
    "All that is necessary for the triumph of evil is that good men do nothing." (hvacrskills)


    II CORINTHIANS 3:6

    “Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.”

    the spirit of the law

    The intended meaning of a law by those who wrote it, as opposed to a literal interpretation thereof.

  3. #16
    Join Date
    Mar 2018
    Location
    Kansas Flatlands
    Posts
    278
    Post Likes
    Local codes and/or inspectors may not let you install a furnace that does not meet efficiency standards of today even if you were to find a "new in the box" standing pilot furnace.

  4. #17
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,603
    Post Likes
    You can buy a sealed combustion 80% furnace. No secondary to plug and combustion air fro out of doors....

  5. #18
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    20,796
    Post Likes
    Extremely Dusty??
    With what?
    You may not be allowed a flame in the area sealed or not!

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