34
2
4
6
8
10
12
14
16
18
20
VERTICAL
RISE (ft)
HORIZONTAL RUN (ft)
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
V2
V1
V3
H2
H1
45° elbow take-off
supplied with unit
Vent Terminal
Valor 658DVK2
1” min.
all around
vertical pipe
3” min.
above top of
horizontal pipe
1” min. around
bottom & sides
of horizontal pipe
Use Valor 658TG or
845TG Terminal
guard with a
vent terminal
located at less
than 7’ (2.13 m)
above grade
Min. 24” total
rise required
Allowable Co-Axial Vent Con
fi
gurations with
restrictor positions
NO INSTALLATION
Position #2
Position #1
Position #3
Position #4
Example 1
No restrictor
below 4’–0”
Example 1
V Value = V1 (3’) + V2 (2’) + V3 (1’)= 6’
H Value = H1 (3’) + H2 (2’) = 5’
Restrictor position #1 required
NO INSTALLATION
Co-axial Venting
4 x 90º ELBOWS MAXIMUM
(or equivalent)
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 in
the vent system.
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-off 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 next
section.
Note:
The restrictors are shipped loose with the
appliance.
Venting Chart
QUALIFIED
INSTALLER
