Bacharach Fyrite INSIGHT Instructions Manual page 37

Fyrite INSIGHT
Hot Water Tank – Domestic hot water tanks with the 'bell' shaped draft
diverter on top can be accurately tested by inserting the probe tip directly
into the top of the fire tube below the diverter.
80% Efficiency Fan Assist or Power Vented – Combustion testing of
fan assist or power vented, furnaces/boilers should be done through a hole
drilled in the vent approximately 12 inches above the inducer fan.
90% Efficiency Condensing – Condensing furnaces/boilers can be tested
through a hole drilled in the plastic vent pipe (when allowed by the manufac-
turer or local authority of jurisdiction) or taken from the exhaust termination.
After testing, the hole should be sealed with high temperature silicon.
Atmospheric or Gravity Vented Boiler – Boilers, which have a 'bell'
shaped draft diverter directly on top, should be tested directly below the
diverter through a hole drilled in the vent connector.
NOTE: Seal all drill holes upon completion of combustion testing.
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