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21
4 x 90º ELBOWS MAXIMUM
(or equivalent)
VE
RT
IC
AL
RI
SE
(f
t)
HORIZONTAL RUN (ft)
0
2
4
6
8
10
12
14
16
18
20
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
0
Position #4
Position #3
Positions #2
Position #1
Example 1
NO INSTALLATION
NO INSTALLATION
Allowable Co-Axial
Vent Con
fi
gurations with
restrictor positions
How to Read the Venting Chart
The chart below applies to co-axial roof or wall
termination.
1. A minimum vertical rise of 24 inches is required
directly o
ff
the unit or after
fi
rst elbow, as shown.
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
equivalent (2 x 45 degrees = 90 degrees)—can
be used. Excludes the 45 degrees take-o
ff
elbow
shipped with the appliance.
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 “Restrictor
Settings” on page 22.
Note:
The restrictor is shipped installed at the
exhaust exit of the
fi
rebox.
Venting Chart
Example 1
V Value = V1 (4’) + V2 (3’) + V3 (2’)= 9’
H Value = H1 (2’) = 2’
Restrictor position # 1 required
24” minimum
vertical pipe rise
Venting
Co-Axial
not to
scale
V2
V1
V3
H1
Minimum 24” vertical
pipe rise required
45° elbow vertical take-off
supplied with unit.
1” min.
all around
vertical pipe
3” min.
above top of
horizontal pipe
1” min. around
bottom & sides
of horizontal pipe
DO NOT CONVERT
TO REAR OUTLET!
SHOULD NOT BE
CONVERTED TO REAR
OUTLET!