Section 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-363 3-7
These installations utilize the boiler-mounted blower to vent the
combustion products to the outside. Combustion air is taken from
inside the room and the vent is installed vertically through the roof
to the outside. Adequate combustion and ventilation air must be
supplied to the boiler room in accordance with the National Fuel
Gas Code or, in Canada, the latest edition of CAN/CSA-B 149.1 and
149.2 Installation Code for Gas Burning Appliances and
Equipment.
To prevent accumulation of condensation in the vent, it is required
to install the horizontal portion of vent with a slight slope of at least
1/4” per foot of horizontal run, pitched either back to the boiler or
to a low point equipped with suitable condensate trap and drain.
!
Warning
No substitutions of flue pipe or vent cap material are allowed. Such
substitutions would jeopardize the safety and health of inhabitants.
3.3 VERTICAL VENTING / DIRECT VENT OR
SEALED COMBUSTION AIR
Figure 3-3 Vertical Stack with Direct Venting/Sealed Combustion
Vent Termination
Air Intake (w/Screen)
48" Minimum
48"
Minimum
12"
Minimum
above roof
or snow line
Vent Termination
Air Intake (w/Screen)
48" Minimum
12" Minimum
above parapet
or snow line
36" Minimum
above intake
24" Minimum
With parapet wall
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