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VENTING
8.6.2 LP Gas Installations
IMPORTANT: Horizontal vent sections require 1/4 in (6 mm) rise
for every 12 in (305 mm) of travel.
IMPORTANT: A wall thimble pass-through must be used on all
horizontal vent runs that pass through interior or exterior walls.
Follow vent manufacturer’s instructions.
8.6.2.1 Vertical Terminations
Table 8.6, LPG - Minimum / Maximum Vertical Terminations
Minimum Vertical Length
Maximum Vertical Length
3 ft
914 mm
50 ft
15.2 m
8.6.2.2 Combination Venting
Table 8.7, LPG - Minimum Horizontal Vent Terminations
Minimum
Vertical Rise (V
MIN
)
Minimum
Horizontal Run (H
MIN
)
Maximum
Horizontal Run (H
MAX
)
9 in
229 mm
6 in
152 mm
18 in
457 mm
15 in
381 mm
6 in
152 mm
48 in
1219 mm
Table 8.8, LPG - Max Vertical / Max Horizontal Combination
Maximum
Vertical Rise
Maximum
Horizontal Run
Total Length
20 ft
6.1 m
20 ft
6.1 m
40 ft
12.9 m
Maximum number of 90° elbows: 4
0
2
4
6
8
10
12
14
16
20
22
18
24
26
28
30
40
38
36
34
32
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
(6.1m)
(12.9m)
(6
.1
m
)
(9
.1
4m
)
(ft.)
42
44
46
48
50
(15.2m)
Figure 8.3, LPG - Top Vent Combination Venting (V/H)
TOP VENTING DIAGRAM (HORIZONTAL TERMINATIONS)
(A)
Stand-off Brackets
(B)
Stand-off Heat Shields
(C)
90
°
Elbow
(D)
Horizontal Heat Shield (not
applicable)
(E)
Termination Cap
E
C
B
A
V
MIN
H
MIN
H
MAX
9” (229mm) V
MIN
+ 90° ELBOW + 6” (152mm) H
MIN
/ 18” (457mm) H
MAX
15” (381mm) V
MIN
+ 90° ELBOW + 6” (152mm) H
MIN
/ 48” (1219mm) H
MAX
E
B
A
3ft (914mm) MIN / 50ft (15.2m) MAX