22
2
4
6
8
10
12
14
16
18
20
VE
RT
IC
AL
RI
SE
(f
t)
HORIZONTAL RUN (ft)
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
4 x 90º ELBOWS MAXIMUM
(or equivalent)
Position #9
NO INSTALLATION
H1
Supplied
with 5” x 8”
vent outlet
Maximum 24”
horizontal pipe
with no rise
3” min.
above top of
horizontal pipe
1” min. around
bottom & sides
of horizontal pipe
Position #8
Position #6
Position #
0
Allowable Co-Axial Vent Con
fi
gurations
with restrictor positions
— with 5” x 8” pipes
How to Read the Venting Chart
The chart below applies to co-axial roof or wall
termination.
1. Maximum 24 inch horizontal pipe section allowed
when using a 90 degrees elbow directly at the
appliance.
2. The total length of the vent pipe cannot exceed
40 feet.
3. The minimum vertical height with roof termination
is 6 feet.
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 equiva-
lent (2 x 45 degrees = 90 degrees)—can be used.
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 restrictors are shipped installed at the
exhaust exit of the
fi
rebox.
Venting Chart with 5” x 8” pipes
NO INSTALLATION
Venting
Venting Chart—5” x 8”
