Filter
Top Products
Heat & Glo • Paloma • 7031-220 Rev. P • 10/0812
EX. 2
EX. 1
2' 4' 6' 8' 10' 12' 14' 15'
30'
28'
26'
24'
22'
20'
18'
16'
14'
12'
10'
8'
6'
4'
2'
0'
(MAX)
(MIN)
32'
34'
35'
11-5/8”
3 ft. (914 mm) Maximum Horizontal run with no
vertical pipe and with 1/4 in. (6 mm) rise per foot.
6 ft. (2 m) Minimum
Vertical Termination
For rear vent or top
of appliance for top
vent.
C
L
6 in. (152 mm) Minimum starter pipe
C
L
VERTICAL DISTANCE
FROM APPLIANCE
TO THE 90º ELBOW
TOTAL HORIZONTAL RUN TO
OUTSIDE OF EXTERIOR WALL
(INCLUDING ELBOWS)
To adjust the vent restrictor
plate, see page 34.
VENT RESTRIC
T
OR
PLA
TE REQUIRE
D
Figure 5.2
D. How to Use the Vent Graph
1. Measure the distance from the top of appliance to the
center of the 90° elbow. On the graph below, draw a
horizontal line from that measurement on the vertical
axis across until it intersects with the slanted line.
2. From the point of this intersection, draw a vertical line
to the bottom of the graph.
3. The point at which this line meets the bottom line of the
graph is the maximum length of the horizontal run.
Example 1: If the vertical dimension from the top of the
appliance to the center of the 90° elbow is 7 ft. (2 m), the
horizontal run to the outer wall fl ange must not exceed 13
ft. (4 m).
Example 2: If the vertical dimension from the top of the
appliance is 21 ft. (6.4 m), the horizontal run to the outer
wall fl ange must not exceed 9 ft. (3 m).
4. Each 90° elbow is equivalent to 3 ft. (914 mm) of vent
pipe and each 45° elbow is equivalent to 1 ft. (305
mm) of vent pipe, and must be subtracted from vent
pipe run. A single vertical to horizontal 90° elbow is
already calculated into the allowable 15 ft. (5 m) run.
Each additional 90° elbow reduces the maximum
horizontal distance by 3 ft. (914 mm).
Example: The use of three elbows would reduce the
allowable horizontal run to 9 ft. (3 - 1 = 2 elbows x 3 ft.
= 6 ft.; 15 ft. max. - 6 ft. = 9 ft. max.)
E. Venting Guidelines
• The maximum horizontal vent run is 15 ft. (5 m) when
the vertical vent rise is 10 ft. (3 m).
• The minimum horizontal vent run is 11-5/8 in. (295
mm).
• Horizontal sections require a 1/4 in. (6 mm) rise for
every 12 in. (305 mm) of horizontal travel.
•
Horizontal sections require noncombustible support
every 3 ft. (914 mm), e.g. wall strap.
• Wall thickness: Minimum 4 in. (102 mm). Maximum 20
in. (508 mm).
• Vent Diameter: Exterior 6-5/8 in. (168 mm); Inner 4 in.
(102 mm).
EXCEPTION FOR REAR VENT KIT
(Snorkel Kit SLK-
SNKD), HORIZONTAL INSTALLATION:
• The maximum horizontal vent run is 3 ft. (914 mm).
• The maximum horizontal vent run with a 45° elbow is 2
ft. (610 mm).
•
No external minimum rise is required. The minimum
horizontal vent run is 11-5/8 in. (295 mm).
• For any vertical rise when rear venting, a minimum of 2
ft. (610 mm) vertical must be used prior to any horizontal
run.
• Snorkel Kit (SLK-SNKD) must be used for horizontal
vent runs with no vertical rise.