20
IMPORTANT
Flame height and appearance will vary depending upon vent configuration and type of fuel used.
11.4
Venting for Horizontal Terminations
11.4.2
Horizontal Termination 8” x 5” Vent Configurations
Natural Gas
Minimum
90° elbow
+
9 in. (229 mm) horizontal run
+
Termination cap
Maximum
90° elbow
+
4 ft. (1.22 m) horizontal run
+
Termination cap
LP Gas
Minimum
90
°
elbow
+
9 in. (229 mm) horizontal run
+
Termination cap
Maximum
A 6 in. (153 mm) vertical pipe
with
a 9 in.
(229 mm) vertical pipe
+
90
°
elbow
+
4 ft. (1.22 m)
horizontal run
+
Termination cap
Table 11.2, All Approved Horizontal Vent Systems, Clearances to Combustible Material
Top
Bottom
Sides
Vent Pipe
Clearances
1 in. (25 mm)
1 in. (25 mm)
1 in. (25 mm)
11.4.1
Vent System Clearances
90° Elbow
Stand-Off Heat
Shield
Termination Cap
Horizontal Run
Vertical Rise
Figure 11.2, Appliance shown with 8” x 5”
Minimum Horizontal Termination
Vent Configuration
IMPORTANT
Horizontal vent sections require 1/4 in. (6 mm) rise for every 12 in. (305 mm) of travel.
11.4.3
Horizontal Termination 6-
5/8” x 4” Reducer Vent Configurations
Natural Gas and LP Gas
Minimum
6-5/8” x 4” Reducer
+
12 in. (305 mm)
vertical length
+
90
°
elbow
+
9 in. (229 mm)
horizontal run
+
Termination cap
Maximum
6-5/8” x 4” Reducer
+
12 in. (305 mm)
vertical length
+
90
°
elbow
+
3 ft. (9144 mm)
horizontal run
+
Termination cap
Figure 11.3, Appliance shown with 6-5/8” x 4”
Reducer Minimum Horizontal Termination
Vent Configuration
90° Elbow
Stand-Off Heat
Shield
Termination Cap
Horizontal Run
Vertical Rise
Reducer
