CFC-E Installation Manual
Part No. 750-459 2-9
2.5 - 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 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 2-6 Vertical Stack with Direct Vent Combustion Air
WITH
PARAPET
WALL
THIS DRAWING IS DIAGRAMMATIC AND DOES NOT REPRESENT THE FULL
EXTENT OF VENTING LAYOUT REQUIREMENTS. FINAL VENT ROUTING
SHALL BE COORDINATED WITH GAS PIPING, COMBUSTION AIR DUCTING
(IF APPLICABLE) AND OTHER INTERFERENCES THAT ARE POSSIBLE IN
THE FIELD.
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