Construction Details Of Vertical Vent And Air Intake Terminations; Vertical Vent Using Slope Adapter - Thermo Pride CMA4-50D36N Installation And Service Manual

The furnace may be vented vertically through the roof. The outlet/inlet of the vent
and air intake terminations shall be a minimum of 12 inches above highest
anticipated snow level. The vent outlet must be installed a minimum of 12 in.
above the air intake inlet. The combustion air intake shall be installed upwind of
the vent outlet when exposed to prevailing winds. The exhaust vent and
combustion air intake can be a minimum of 3 in. and a max. of 24 in. apart (see
Figures 11 & 12). When installing dual 2" PVC pipes and the 2" flashing plates
(AOPS7484) on pitched roof, slope adapter may be used to simplify installation.
When the PVC vent and combustion air intake pipes pass through a ceiling, and
a fire stop is required. Refer to the following:
Figure 11.
Figure 12.
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