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18-CE03D1-1F-EN
EX. 3—
Example 3 shows that the exhaust vent may go vertical while the inlet
air may be on any side of the structure. The vent pipe would decide
the maximum equivalent length for the pip depending on the furnace
and pipe size.
EX. 4—
Example 4 shows the vent exiting one side of the house while the inlet
air is on the opposite side of the structure. Here the vent pipe length
must be within the allowable length for the size of Furnace and size of
the vent pipe. This example demonstrates that the pipes do not have
to exit on the same side of the structure.
Attaching Vent Piping
VENT FITTING MATERIAL – PLASTIC
Gas and liquid tight single wall vent fittings, designed for resistance to
corrosive flue condensate, MUST be used throughout.
Listed in the Approved Vent Pipe Materials table are designations for
different types of 2" and 3" size pipe and fittings that meet these
requirements. The materials listed are various grades of PVC, CPVC,
ABS, PolyPro® by DuraVent , Z-Dens by Novaflex Group, Innoflue®
by Centrotherm, and PolyFlue™ polypropylene venting systems.
ATTACHING VENT PIPING
Important: Products installed in Canada must use vent systems that
are certified to the Standard for Type BH Gas Venting
Systems (ULC S636) for Class II-A venting systems (up
to 65°C). Components of the vent system must not be
interchanged with other vent systems or unlisted pipe or
fittings. Plastic components, specified primers, and glues
must be from a single system manufacturer and not
intermixed with other system manufacturer's vent
system parts. In addition, the first three feet of the vent
pipe must be visible for inspection.
PIPE JOINTS: All joints must be fastened and sealed per manufacturer
instructions and local and national codes to prevent escape of
combustion products into the building.
FFuurrnnaaccee GGeenneerraall IInnssttaallllaattiioonn
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