Results 1 to 12 of 12

Thread: Condensing flue gas's in the chimney

  1. #1
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    446
    Post Likes

    Condensing flue gas's in the chimney

    The negative effect I don't need discussed. What I do need is help finding a link to share discussing the whole negative effect on the equipment and the chimney.

    Do you guys have anything

  2. #2
    Join Date
    Nov 2004
    Location
    Northern Calif
    Posts
    519
    Post Likes
    Isn't it good enough to say it's not code compliant
    I'm not young enough, to know everything...

  3. #3
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    446
    Post Likes
    Thread Starter
    when I'm asking someone to spend 60k to put in a condensing domestic boiler, having something for the customer to read ( which isnt an idiot and asks lots of questions) it a good idea.

  4. #4
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    12,259
    Post Likes
    Are you trying to explain why you cant just run any boiler at low temp?

    IE why they need a condensing boiler?


    Sent from my iPhone using Tapatalk

  5. #5
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    446
    Post Likes
    Thread Starter
    More directly the deterioration of the chimney. Std tile and mortar.

    I am not getting a google search back that covers everything.

  6. #6
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    12,259
    Post Likes
    Not sure if I can post it here, but I emailed you a link to nfpa - 211

    Also try NFPA 54


    Sent from my iPhone using Tapatalk

  7. #7
    Join Date
    Nov 2011
    Location
    CO
    Posts
    9,695
    Post Likes
    The equipment installation manual covers the required flu piping.....and no manual will tell you to just shove the flu pipe into an existing chimney.....unless the pipe is ran to the roof.

    Just casue the guy isn't a fool, doesn't mean he can tell you to install equipment against manufacturer requirements.

  8. #8
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    446
    Post Likes
    Thread Starter
    A member passed me some good link for info. But before I could use it I decided to show him. We took the insulation off the flue and holy hell it was bad. The insulation in places was the flue in a section.
    Main boiler was 4.5m summer domestic boiler was a copperfin 2 750k . No longer. He now understand why I am recommending a lochinvar Armor.
    Yes the flue is being replaced already.

    I enjoy taking on these projects. This is a new customer of ours that has had years of bad service.

  9. #9
    Join Date
    Nov 2011
    Location
    CO
    Posts
    9,695
    Post Likes
    So basically, he had become accustomed to educating himself to try to save money! Good for him.

    And good for you for showing the "proof"! He will end up being a great customer!

  10. #10
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    446
    Post Likes
    Thread Starter
    He has been in this position for 2 years. And the boiler there for 11. So he also walked into the mess also. But he is a great customer already. He listens, can understand the technical discussions and wants to make the mechanical room correct and efficient.

  11. #11
    Join Date
    Nov 2011
    Location
    CO
    Posts
    9,695
    Post Likes
    Man, try to make that guy happy!! Those customers can be few and far between!

  12. Likes Cool breeze 38 liked this post.
  13. #12
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    7,353
    Post Likes
    A chimney must be suitable for the class of service. A 'chimney' is not rated for positive vent pressure. If you have a CAT III or IV gas appliance, it must be vented using listed venting (UL1738) unless otherwise expressly listed by the equipment mfr. for that appliance (e.g. PVC). You cannot common vent positive vent pressure appliances unless all are listed venting together.
    You can reference NFPA 211 and either the Nat'l or Int'l Fuel gas codes. Most vent mfrs. have a handbook for vent design that discusses these issues. Most liner mfrs. have brochures that discuss flue gas condensation damage.
    In general, EVERY masonry chimney should be relined with a listed liner system as NONE can pass a level II exam. See Ch 15 in '211. You can view it for free online.
    HTH

Posting Permissions

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