Chapter 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-263 3-9
D.VERTICAL VENTING / INSIDE COMBUSTION AIR
(CATEGORY III & IV) CENTRAL HEATING
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
.2 Installation Code for Gas Burning Appliances and Equipment.
UL 17-38 Certified Venting Material (e.g. AL29-4C) MUST be used.
The vent must be installed to prevent flue gas leakage. Care must
Figure 3-5 Vertical Stack with Inside Combustion Air
CFC Boiler
Flue Gas Vent (w/Screen)
24"
Minimum
10'-0" or Less
24"
Minimum
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