VENTING
23
7.7 Top Venting
IMPORTANT: The vertical vent heat shield MUST be installed
for every type of top venting application. The horizontal vent
heat shield must be installed when incorporating minimum
horizontal venting. Refer to 7.8 Vent Heat Shield Assembly
Installation, on page 24.
IMPORTANT: Horizontal vent sections require ¼ in (6 mm) rise
for every 12 in (305 mm) of travel.
7.7.1 Vertical Terminations
Table 7.3, NG/LPG - Minimum / Maximum Vertical Terminations
Minimum Vertical Length
Maximum Vertical Length
3 ft
914 mm
50 ft
15.2 m
7.7.2 Combination Venting
Table 7.4, NG/LPG - Minimum Vertical / Maximum Horizontal
Minimum Vertical
Venting
Minimum
Horizontal Run
Maximum
Horizontal Run
90° elbow off
appliance top
6 in
152 m
8 ft
2.4 m
Table 7.5, NG/LPG - 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
Figure 7.2, Top Vent Combination Venting
TERMINATION
CAP
VERTICAL VENT
HEAT SHIELD
STAND-OFF
BRACKETS
MIN: 3 ft (914mm)
MAX: 50 ft (15.2 m)
Figure 7.3, Top Vent Vertical Termination - Natural Gas and LP Gas
90° ELBOW
TERMINATION
CAP
STAND-OFF
BRACKETS
MIN:
6 in (152mm)
MAX:
8 ft (2.4m)
HORIZONTAL VENT
HEAT SHIELD
VERTICAL VENT
HEAT SHIELD
Figure 7.4, Top Vent Minimum Vertical / Max Horizontal
