VENTING
25
7.6 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. See Section 7.7 on page 26.
IMPORTANT: Horizontal vent sections require 1/4 in (6 mm) rise
for every 12 in (305 mm) of travel.
7.6.1 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
7.6.2 Combination Venting
Table 7.4, NG/LPG - Minimum Horizontal Vent Terminations
Minimum Vertical
Venting
Minimum
Horizontal Run (H
MIN
)
Maximum
Horizontal Run (H
MAX
)
90° elbow
6 in
152 mm
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, NG/LPG - Top Vent Combination Venting (V/H)
TOP VENTING DIAGRAM (VERTICAL & HORIZONTAL TERMINATIONS)
(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
NG/LPG - 90° ELBOW + 6” (152mm) H
MIN
/ 8ft (2.4m) H
MAX
NG/LPG - 3ft (914mm) MIN / 50ft (15.2m) MAX
H
MIN
H
MAX
A
B
C
D E
F
A
B
D
F
