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VENTING
8.6 Combination Venting
8.6.1 Natural Gas Installations
IMPORTANT: The vertical vent heat shield included with this
fireplace must be installed for all venting configurations. The
horizontal vent heat shield must be installed when incorporating
minimum horizontal venting. Refer to Section 8.8 on page 31.
IMPORTANT: Horizontal vent sections require 1/4 in (6 mm) rise
for every 12 in (305 mm) of travel.
IMPORTANT: Natural gas and LP gas vent installations
terminating with a snorkel cap require a minimum of 24 in
(610mm) of vertical venting off the top of the appliance before
the use of an elbow.
Table 8.4, NG - Minimum Horizontal Vent Terminations
Minimum
Vertical Rise
Minimum
Horizontal Run
Maximum
Horizontal Run
12 in
+ 6 in
305mm
+ 152mm
9 in
229 mm
36 in
914 mm
Table 8.5, NG - Max Vertical / Max Horizontal Combination
Maximum
Vertical Rise
Maximum
Horizontal Run
Total Length
25 ft
7.6 m
25 ft
7.6 m
50 ft
15.2 m
Maximum number of 90° elbows: 5
NATURAL GAS MINIMUM HORIZONTAL VENTING DIAGRAM
(A)
Stand-off Brackets
(B)
Stand-off Heat Shields
(C)
90
°
Elbow
(D)
Vertical Vent Heat Shield
(E)
Horizontal Vent Heat Shield
(F)
Termination Cap
Figure 8.2, Natural Gas Combination Venting
12” (305mm) VENT PIPE
6” (152mm) VENT PIPE
9” (229mm) VENT PIPE
A
B
C
D
E
F
12” (305mm) VENT PIPE
6” (152mm) VENT PIPE
36”
(914mm)
A
B
C
D
E
F
