Results 1 to 9 of 9
  1. #1
    Geoff Stewart's Avatar
    Geoff Stewart Guest

    Default Furnace exhaust flue clearance

    Manufactured home, Coleman gas furnace and American gas water heater. Both units have this flue installation. In the picture it's a bit difficult to tell but that square piece screwed to the sheet rock is a thin hard wafer of some sort. It does not appear to be metal. At least with the metal collars sometimes you can pull them down a bit to check for the 1" clearance to combustibles.

    So I guess my question is what is that wafer made from and why is anything other than metal, including sealants which can be fire resistant but not fireproof, allowed to be in contact with the flue. I see this in manufactured homes a lot in my area. Thanks, this is my first post.

    Similar Threads:
    Member Benefits1

  2. #2
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Default Re: Furnace exhaust flue clearance

    No picture.

    Keep the fire in the fireplace.

  3. #3
    Geoff Stewart's Avatar
    Geoff Stewart Guest

    Default Re: Furnace exhaust flue clearance

    Sorry, first post. Will try again.

    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images

  4. #4
    Join Date
    Jul 2008
    Location
    Utah
    Posts
    389

    Default Re: Furnace exhaust flue clearance

    Quote Originally Posted by Geoff Stewart View Post
    Sorry, first post. Will try again.
    What a hack job on the sealant. Even the screws and staples are placed irregularly. It appears like a DIY'r add on after the fact, not the sort of work you'd expect to see coming out of a pre-fab place,

    It is hard to see in the picture but could it be cement board, the type used as an under-layment for tile?


  5. #5
    Geoff Stewart's Avatar
    Geoff Stewart Guest

    Default Re: Furnace exhaust flue clearance

    Yeah, that's what I thought, cement board. But I see it so often in manufactured homes around here that I'm thinking that it's probably not a DIY'r thing. Probably the HVAC guys or other contractor. Thanks.


  6. #6
    Join Date
    Jul 2008
    Location
    Snowbird (this means I'm retired and migrate between locations), FL/MI
    Posts
    4,086

    Default Re: Furnace exhaust flue clearance

    Fuel-fired HVAC and water heating equipment used in manufactured or "mobile" homes must be specifically listed for installations in same. Installing and the use of such equipment must be done following the instructions for same.

    It is beyond unwise to do otherwise.

    What has been described and photographed, as represented, would be hazardous and dangerous, along with its associated Civil and possibly Criminal liability mine-field.


  7. #7
    Geoff Stewart's Avatar
    Geoff Stewart Guest

    Default Re: Furnace exhaust flue clearance

    Thanks to all who replied. I now have a different view in terms of how I report this condition in the future.


  8. #8
    Join Date
    Mar 2007
    Location
    Western Montana
    Posts
    261

    Default Re: Furnace exhaust flue clearance

    Beyond the question of vent clearance to combustibles. As HG said, the furnace probably isn't listed for install in a manufactured home. In large part, it has to do with combustion/dilution air supply. Manufactured homes are constructed pretty tightly, which is why the Coleman furnaces and gas/propane water heaters are direct vent, pulling combustion air from outside.


  9. #9
    Join Date
    Sep 2010
    Location
    NY Finger Lakes Area
    Posts
    206

    Default Re: Furnace exhaust flue clearance

    .............take a look at the connection to the furnace. More than likely, you will find the actual 4" flue connection that runs up inside of that 10" pipe depicted in your photo. This is a typical HUD code manufactured home chimney assembly, and is supposed to be tightly finished at the ceiling. The large diameter pipe maintains the correct clearances without concern for distance to combustible surfaces. This is an especially sloppy job and should be noted as such-but as presented, poses no hazard.........Greg.


Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •