Vertical Venting / Inside Combustion Air; Vertical Stack With Inside Combustion Air Diagram - CleaverBrooks CFC Operation, Service & Parts Manual

Section 3 — Stack and Intake Vent Sizing and Installation
3-8
D. VERTICAL VENTING / INSIDE COMBUSTION AIR
10'-0" or Less
CFC Boiler
Figure 3-3 Vertical Stack with Inside Combustion Air
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.
Flue Gas Vent
Termination
24"
Minimum
48"
Minimum
Part No. 750-263