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  1. #1
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    Oct 2018
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    Lennex Furnace from the 50s

    Hi I bought my very first home last summer. I had my furnace looked at prior to winter last year is was/is working in tip-top shape. Now that winter is upon us again, I am trying to figure out how to replace the filter on it. I believe it to behind the flute pipe but I want to be sure and possibly find a manual for this furnace. I have contacted the last HVAC tech to see if I could get the information off of them and they are now retried. I have reached out Lennox directly and they are looking to see if they have the manual. I have attached photo's of the furnace and the model number is GHR5-95M.

    Thank you!
    Attached Images Attached Images      

  2. #2
    Join Date
    Aug 2009
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    Beatrice, NE
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    I believe you will find the filter behind the flue pipe. Usually that is a split door that comes off in 2 pieces, the filters I have seen on Lennox downflow are also 2 piece. Your may be different but the reason for the 2 piece would be so you don't have to disconnect the flue pipe to replace the filter.

  3. #3
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    Oct 2018
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    Thread Starter
    That is what I was thinking too. The piece of behind the flute pipe is one piece but the top of furnace in that area has 4 screws keeping it in place. I believe that that comes off and the piece slides out the top. Now this may be a silly question, it says I am going to need a 24x10 blanket filter, where would be the best place to purchase one?

  4. #4
    Join Date
    Jan 2014
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    New England
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    Your unit may have a metal filter rack that opens to replace a cut piece of rolled filter?

    Possibly you have a return air filter grille that the filter is mounted at the return grille?

    May be a belt drive blower instead of direct drive?

    May not even have any filters

  5. #5
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Pushing 70 please get the heat exchanger checked!

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
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    Quote Originally Posted by Bazooka Joey View Post
    Your unit may have a metal filter rack that opens to replace a cut piece of rolled filter?

    Possibly you have a return air filter grille that the filter is mounted at the return grille?

    May be a belt drive blower instead of direct drive?

    May not even have any filters
    Should be 2 racks in the top section of furnace, each one would hold a piece of roll filter cut to size. Counterflow furnaces used 24 filter roll as marked on the unit.

  7. #7
    Join Date
    Sep 2002
    Posts
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    I wonder if that's the Lennox model with the cast iron heat exchanger?

    I think the Lenox part number for the filter material you need is: LB-71455

    It's called: Hammock Filter Material (because of the shape of the rack it typically goes on)

    If the way the filter rack works isn't obvious to you - check back here for instructions.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  8. #8
    Join Date
    Jan 2014
    Location
    New England
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    Is that thermostat wire original? It almost looks like it says Made in Mexico with a year under those words by the gas valve. If so, they sure got an early start with outsourcing parts....

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