Operating instructions

5 x 90º ELBOWS
MAXIMUM
Restrictor 75
NO
RESTRICTORS
Example 1
NO INSTALLATION
NO
INSTALLATION
V3
Restrictor 50
2 4 6 8 10 12 14 16 18 20
12
Venting
Allowable Vent
Confi gurations
Example 1
V Value = V1 (6’) + V2 (6’) + V3 (2’)= 14’
H Value = H1 (3’) + H2 (3’) = 6’
75% restrictor required
VERTICAL RISE
HORIZONTAL RUN
Not to scale
Roof termination
Wall termination
How to Read
the Venting
Chart
1. The total length of the vent pipe cannot exceed 40 feet (12.2 m).
2. The minimum vertical height with roof termination is 8 feet (2.45 m).
3. Any combination of rise and run can be used as long as they are within the allowable limits shown
on the chart below.
4. A maximum of 5 x 90 degrees elbows or equivalent (2 x 45 degrees = 90 degrees) can be used.
5. 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.)
6. All horizontal pipe runs must be graded 1/4 inch per foot upwards in the direction of the exhaust
fl ow.
7. Co-linear rear venting in existing chimney systems is limited to 40 feet vertical rise.
8. Restrictors are not required for co-linear installations.
1” clearance
to combustible
at bottom
and sides of
horizontal pipe
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
The chart below applies to top or rear outlet, roof or wall termination with a vertical rise.
All rear outlet venting without a vertical rise must be terminated by a snorkel.
3” clearance
to combustible
above
horizontal pipe
1” clearance
to combustible
around vertical
pipe