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Reducing Vent Connectors On 3 PB Boilers, OK or Not?

JUGHNE
JUGHNE Member Posts: 8,980
I am installing 3 boilers totaling 590,000 BTU. Will have 10" SS liner 45' high, I'm thinking plenty of draft will be available.

Each boiler will allow a 1" reduction in connector after the vent damper. So the 7" goes to 6" and the 2 8"'s go to 7".

Short connector rise 2' to 3'. Less than 15' horizontal common pipe.

Is the reduction advisable?

Are venting wyes preferred over tees?

The tees always seemed sloppy fit verses the Wyes.
I think of fluid flow as in plumbing drains.....logical or not?
TIA.

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 5,324
    Yes wyes over tees.



    steve
    JUGHNE
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 10,363
    I think I would nix the reduction and use Ys
  • JUGHNE
    JUGHNE Member Posts: 8,980
    Is there a reason to not use the reducers at the boiler and then use the Wyes?
    clammy
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 10,363
    Well, I assume your coming out of the chimney 10" and traveling close to 15'. That's a fairly long horizontal run, and then putting in two Y fittings.Also the riser off the boiler is only 2-3'.

    I just don't see much to gain or any real savings by using reducers. Maybe I am not looking at it right
  • JUGHNE
    JUGHNE Member Posts: 8,980
    I wasn't looking at material savings by the reducers just the best install for draft.

    One of the larger boilers is right at the chimney connection point.
    I was wondering about too much draft on that one.
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,324
    This article may offer some insight
    https://fueloilnews.com/2016/06/23/flue-pipe-design/
    steve