Operation
Fyrite
InTech
Manual
42
0024-9486 Rev 4
Example 90% Efficiency
Condensing Furnace
Example 80% Efficiency
Fan Assist or Power
Vented Furnace
Example
Atmospheric/Gravity
Vented Boiler
Condensing
furnaces/
boilers can be tested
through a hole drilled in
the plastic vent pipe
(when allowed by the
manufacturer
or local
authority of jurisdiction)
or taken from the exhaust
termination.
Combustion testing of fan
assist or power vented,
furnaces/boilers should be
done through a hole
drilled
in
the
vent
immediately above the
inducer fan.
Boilers, which have a ‘bell’
shaped draft diverter on
top, should be tested
directly below the diverter
through a hole drilled in
the vent connector.
IMPORTANT: Review manufacturer recommendations for the
combustion device being tested, and be aware of accepted
practices of the local jurisdiction before introducing sampling holes
into exhaust pipes or ducts.
CAUTION: To avoid the introduction of dangerous exhaust gases
into the space, be sure to completely and securely seal any sampling
holes made in the exhaust pipes or ducts.
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