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Test Port
Figure 4.
external to the unit. A flue gas sampling port available
as a component of the ULC S636 certified vent system
is preferred. However, if one is not available with the
certified vent system, manufacturer suggests using
Allowable Single Wall Stainless Steel Vent Suppliers and Part Numbers
Table 4.
Allowable Polypropylene Vent Manufacturers / Trade Names
Table 5.
FT
Manufacturer Model Numbers (abbreviated)
Manufacturer Model Numbers (abbreviated)
a tee with the branch connection sized to allow for
insertion of a flue gas analyzer probe. The branch
connection must be resealable with a cap or other
means to ensure the vent system remains sealed.
(See Figure 4)
Consideration must be given to the placement and
orientation of the flue gas sampling port to ensure that
condensate is free to flow back into the unit and not
collect anywhere in the vent system - including in the
flue gas sampling port.
2.B.1.b Exhaust Vent Terminal -
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the certified
vent system, the manufacturer suggests the use of a
coupler fitting from the certified vent system into which
the vent terminal screen can be installed. Be sure
to install and terminate both vent and combustion air
pipes per the instructions in this section.
Page 15
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