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drilling test holes in direct vent
in Gas Heating
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 ??
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.0
I believe they are referring to a 2 pipe system with separate exhaust and intake0
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