CFC-E Installation Manual
2-8 Part No. 750-459
2.4 - Vertical Venting / 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.
Figure 2-5 Vertical Stack with Inside Combustion Air
THIS DRAWING IS
DIAGRAMMATIC AND
DOES NOT REPRE-
SENT THE FULL
EXTENT OF VENT-
ING LAYOUT
REQUIREMENTS.
FINAL VENT ROUT-
ING SHALL BE
COORDINATED
WITH GAS PIPING,
COMBUSTION AIR
DUCTING (IF APPLI-
CABLE) AND OTHER
INTERFERENCES
THAT ARE POSSIBLE
IN THE FIELD.
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