BOILER BOOK CFC-E STACK/BREECHING SIZE CRITERIA
43
Horizontal Through the Wall Stack Venting
Direct Vent Combus tion. See Figure 33.
Figure 33. Horizontal flue through-wall with direct vent combustion intake
These installations utilize the boiler-mounted blower to take combustion air from the outside and
vent combustion by-products to the outside.
The direct vent combustion air vent cap is not considered in the overall length of the venting system.
The stack vent must be installed to prevent the potential accumulation of Condensate in the stack
pipes. It is recommended that:
1. The vent shall be installed with a slight downward slope of not more than 1/4” per foot of
horizontal run to the stack termination.
2. The stack vent is to be insulated through the length of the horizontal run.
Note: For installations in freezing climates, it is recommended that:
1. The vent shall be installed with a slight upward slope of not more than 1/4” per foot of horizontal
run to the vent termination. In this case, an approved Condensate trap must be installed per
applicable codes.
2. The stack vent is to be insulated through the length of the horizontal run.
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