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Avoid short horizontal offsets with 90
deg. Elbows. Short offsets can be
difficult to slope and may trap con-
densate.
Fig. 44 − Combustion Air and Vent Pipe Diameter Transition Location and Elbow Configuration
Use 45 deg. Elbows where
possible, to ensure conden-
sate drainage.
Fig. 43 − Near Furnace Vent Connections
FURNACE
NOT IN
HORIZONTAL
SECTION
Slope vent pipe back to the
furnace at least ¼" per foot
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
54
A14546
A93034
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