-19-
Top Venting
VERTICAL TERMINATIONS
COMBINATION VENTING
WARNING: Horizontal vent sections require 1/4” (6 mm) rise for every 12” (305 mm) of travel.
NG/LPG - Minimum / Maximum Vertical Terminations
Minimum Vertical Length
Max Vertical Length
6 ft
1.83 m
40 ft
12.2 m
NG/LPG - Minimum Horizontal Vent Terminations
Min. Vertical
Venting
Min. Horizontal Run
(HMIN)
Max Horizontal
Run (HMIN)
90° elbow
6”
152 mm
4 ft
1.22 m
NG/LPG - Max Vertical / Max Horizontal Combination
Max Vertical Rise
Max Horizontal
Run
Total Length
10 ft
3.1 m
20 ft
6.1 m
30 ft
9.2 m
Maximum number of 90° elbows: 4
NG/LPG - Top Vent Combination Venting (V/H)
Restrictor
100% Closed
Restrictor
50% Closed
TOP VENTING DIAGRAM (VERTICAL & HORIZONTAL TERMINATIONS)
NG/LPG - 90° ELBOW + 6” (152mm) H / 4ft (1.3m) H
MIN
NG/LPG - 6ft (1.83m) MIN / 40ft (12.2m) MAX
(A)
Stand-off Brackets
(B)
(C)
90
°
Elbow
Termination Cap
C
A
A
H
H
B
C
MAX
MIN
MAX