Westinghouse WBMC**500 Manual page 28

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Figure 15 - Unbalanced Venting - Roof Exhaust and Sidewall Intake
NOTE: These drawings are meant to demonstrate system
venting only. The installer is responsible for all equipment and
detailing required by local codes.
Ensure the terminations are screened to prevent blockage
caused by debris or birds.
All vent pipes must be glued, properly supported, and the
exhaust pitched a minimum of 1/4" per foot back to the boiler to
allow drainage of condensate. When placing support brackets
on vent piping, the first bracket must be within 1 foot of the
boiler and the balance of 4 foot intervals on the vent pipe.
Venting must be readily accessible for visual inspection from
the first three feet from the boiler.
An unbalanced vent system can be installed ONLY when the
exhaust is in the vertical position. Failure to do so could result in
serious personal injury or death.
Take extra precaution to adequately support the weight of vent
pipes terminating through the roof. Failure to properly support
roof terminated vent piping could result in property damage,
serious personal injury, or death due to flue gas leakage.
WHL-033 Rev. 1.29.16
Figure 16 - Roof and Sidewall Venting with Stainless Steel