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Venting
How to Read the Venting Chart
The chart below applies to co-axial roof or wall
termination.
1. The total length of the vent pipe cannot exceed
40 feet.
2. The minimum vertical height with roof termination
is 6 feet.
3. A minimum vertical rise of 24" is required off the
unit or after the fi rst elbow.
4. Any combination of rise and run can be used as
long as they are within the allowable limits shown
on the chart below.
5. A maximum of 4 x 90 degrees elbows—or
equivalent (2 x 45 degrees = 90 degrees)—can
be used. Excludes the 45 degrees take-off elbow
shipped with the appliance.
Venting Chart
4 x 90º ELBOWS MAXIMUM
(or equivalent)
3" min.
above top of
horizontal pipe
1" min.
all around
vertical pipe
V2
Minimum 24"
pipe section
V1
45° elbow take-off
supplied with unit
Example 1
V Value = V1 (2') + V2 (3') + V3 (2')= 7'
H Value = H1 (0') + H2 (5') = 5'
Restrictor position # 1 required
20
V3
H1
1" min. around
bottom & sides
of horizontal pipe
6. Each 90 degrees elbow installed on the horizontal
plane is equivalent to a 3 feet horizontal pipe;
therefore, 3 feet must be subtracted from allowable
horizontal run. (45 degrees elbow is equivalent to
18 inches horizontal pipe.)
7.
All horizontal pipe runs must be graded 1/4 inch per
foot upwards in the direction of the exhaust fl ow.
The fi nal pipe length, when terminating through the
wall may be graded downwards slightly to prevent
water migration.
8. A restrictor adjustment is required for most
installations having a vertical rise—see next
section.
Note: The restrictor is shipped installed at the
exhaust exit of the fi rebox.
Allowable Co-Axial Vent Confi gurations
with restrictor positions
Position #4
Position #2/3
Example 1
0
2
4
6
HORIZONTAL RUN (ft)
24" min. vertical
Co-Axial
NO INSTALLATION
Position #1
NO INSTALLATION
8
10
12
14
16
18
20
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