Results 1 to 9 of 9
  1. #1
    Join Date
    Dec 2003
    Posts
    266

    How much air do you for a 150,000 NG Furnace....Not

    Went to do a bid the other day. This is what I found on a 37 year furnace. Tri level home with main return in bottom bedroom behind the tv, behind tight louvered door, under stair well, through 1/3 block 16x20 filter, into small chase then to a 8x17 opening to furnace. There is another opening in chase that goes to a very small flat non filtered grill. I cant believe it didnt burn up

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  2. #2
    Join Date
    Apr 2012
    Location
    Cleveland
    Posts
    611
    That old stuff hold up better when it's treated like crap. I found a 30 year old 100k Rheem a couple weeks ago with almost no return. Furnace was sitting on 4 1 1/2" bricks with nothing cut for a return. Had to look hard to find a small crack in the heat exchanger. New stuff wouldn't make it more than a couple years like that if their lucky.

  3. #3
    Join Date
    Oct 2008
    Location
    Brewster, MA
    Posts
    354
    That's better than what a long passed installer used to do where I work. The only return was that you left the door to the cellar open.

  4. #4
    Join Date
    Jun 2009
    Location
    Northwest IN/Chicago
    Posts
    268
    Had a 1960, 75,000 BTU Carrier furnace run fine for 47 years on two 6" metal returns that went to a tiny grille behind a built in TV cabinet with louvered doors. Thermostat was kept up real high, blower door whistled like crazy and supply ran hot as hell. HX looked perfect when it was removed...

  5. #5
    Join Date
    Oct 2008
    Location
    Brewster, MA
    Posts
    354
    They don't make HX'ers like they used to.

  6. #6
    Join Date
    Sep 2012
    Location
    Missouri
    Posts
    89
    well it looks like you looked everywhere. did you ever find the furnace?? lol

  7. #7
    Join Date
    Jan 2013
    Location
    Champaign Illinois
    Posts
    97
    So that's how u drill a square hole... And here I was waiting time using a sawzall to cut my square lol...

  8. #8
    Join Date
    Oct 2009
    Posts
    984
    Looks like the volacity kept it clean and the leaks kept it alive.
    Never argue with a crazy man.

  9. #9
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,483
    you need ~ 1500 cfm for 150,000 input btu atmospheric vent

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