CFC-E Installation Manual
Part No. 750-459 2-7
2.3.2 - Horizontal Thru-Wall Stack Vent Termination
The stack vent cap MUST be mounted on the exterior of the building. The stack termination cannot be
installed in a well or below grade. The stack termination must be installed at least one (I) foot above
ground level and above normal snow levels.
Multiple stack vent caps should be installed in the same horizontal plane with as much distance
between combustion air intake and flue termination as possible.
Combustion air supplied from outside must be free of particulate and chemical contaminants. To avoid
a blocked flue condition, keep all the vent caps clear of snow, ice, leaves, debris, etc.
If the boiler is vented directly out through the sidewall with no elbows and less than 10 feet of vent
pipe, a restricted direct vent termination should be utilized. A well designed direct vent
termination should minimize the effect of adverse wind conditions
!
Caution
Stack terminations MUST NOT be installed with a combus-
tion air inlet directly above a stack termination. This vertical
spacing would allow the flue products from the stack to be
pulled into the combustion air intake above. This type of
installation can void warranties and may cause poor opera-
tion due to the recirculation of flue products.
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