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Testing type B vent

leroy
leroy Member Posts: 6
in THE MAIN WALL
Where do you test for comb. eff. on cat.1 furnaces withdraft inducer fan and all type B vent.Even though this is negative pressure draft is it possible to have a 0 or even positive pressure draft reading if the reading is taken at a point right on discharge side of draft inducer fan.Can you drill hole in type B vent then seal back up with screw.Thanks.

Comments

  • Rudy
    Rudy Member Posts: 482
    Drilling B vent

    We have letters on file from three B-vent manufacturers allowing the drilling of B-vent for the purpose of CO, draft and combustion testing. To seal the hole, they recommend high temp rtv.

    If anyone needs a copy, email me and we'll get you a copy.
  • Mark A. Custis
    Mark A. Custis Member Posts: 247
    You beat me

    to him Rudy, but youve got the back up.

    All b-vent flues must have a draft. I am sure there are folks here who remember the great sealed plastic flue pipe adventure and then the class action laws suits.

    B-vents gotta draft.

    Mark

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