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Rear
outlet
Top
outlet
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How to Read the Venting Chart
The chart below applies to co-axial roof or wall
termination in installations with vertical rise. See page
25 for installations with no vertical rise.
1. The total length of the vent pipe cannot exceed
40 feet (12.2 m).
2. The minimum vertical height with roof termination
is 10 feet (3.05 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 4 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.
The fi nal pipe length, when terminating through the
wall may be graded downwards slightly to prevent
water migration.
7. Maximum co-linear venting is 40 feet (12.2 m).
8. A restrictor is required for all installations—see
section
Appliance Preparation
section for more
information.
V
ertical Rise (ft)
V
ertical Rise (ft)
Horizontal Run (ft)
Horizontal Run (ft)
NO INSTALLATION
NO INSTALLATION
NO INSTALLATION
NO INSTALLATION
Example 1
Co-Axial Venting
Venting Chart—Allowable Co-Axial Vent Confi gurations with Vertical Rise
QUALIFIED
INSTALLER
Содержание HORIZON 534JN
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