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drilling test holes in direct vent

laxman Member Posts: 8
Recently received  a memo from   a Massachusetts state agency "The installation of direct vented gas heating systems  must include a suitable, resealable combustion   efficiency test hole in the flue pipe unless specifically prohibited  by the equipment manufacturer. The test hole of a direct vent system must be sealed in a manner that  allows access for future testing. "   I know the Burnham Alpine has  a designated test port.  Any other manufacturers that would specifically prohibit this ??


  • Tim McElwain
    Tim McElwain Member Posts: 4,588
    Be careful as to what they

    mean by the term direct vent. Do they mean mechanical exhausting with a separate vent for air and a separate vent for flue gases, or do they mean a concentric vent with flue gases passing through the middle pipe and air being drawn in on the outside pipe? The code makes a definite distinction between direct vent and mechanical exhausting.

    The Alpine is a concentric vent appliance with separation for testing flue gases inner pipe and a separate test point for cross contamination outer pipe.
  • laxman
    laxman Member Posts: 8

    I believe they are referring to a 2 pipe system  with separate exhaust and intake
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