Section 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-263 3-9
Gas Code or, in Canada, the latest edition of CAN/CSA-B 149.1 and
.2 Installation Code for Gas Burning Appliances and Equipment.
To prevent the condensation accumulation in the vent, it is required
to install the horizontal portion of vent with a slight upward slope of
not more than 1/4" per foot of horizontal run and an approved
condensate trap must be installed per applicable codes.
!
Warning
No substitutions of flue pipe or vent cap material are allowed.
Such substitutions would jeopardize the safety and health of
inhabitants.
The Stainless Steel non-restricted direct vent cap must be furnished
in accordance with AGA/CSA requirements.
E. VERTICAL VENTING / DIRECT VENT
COMBUSTION AIR
These installations utilize the boiler
-mounted blower to draw
combustion air from outside and vent combustion products to the
outside.
To prevent condensation accumulation in the vent, it is required to
install the horizontal portion of vent with a slight upward slope of
Figure 3-4 Vertical Stack with Direct Vent Combustion Air
Boiler
Flue Gas Vent (w/Screen)
Air Intake (w/Screen)
36" Minimum
24"
Minimum
12"
Minimum
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