VENTING
23
7.5 Vertical Terminations
NOTE: The flange on the top stand-off must be bent upwards to
a 90° angle.
IMPORTANT: The vertical vent heat shield must be installed for
all venting applications. Refer to Section 7.8 on page 25.
NOTE: Attic insulation shields may be insulated using unfaced
insulation products listed as non-combustible per ASTM E 136.
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 Combination Venting
IMPORTANT: The horizontal vent heat shield must be installed
when incorporating minimum horizontal venting. Refer to
Section 7.8 on page 25.
IMPORTANT: Horizontal vent sections require ¼ in (6 mm) rise
for every 12 in (305 mm) of travel.
Table 7.4, NG & LPG - Minimum Horizontal Vent Terminations
Minimum
Vertical Rise (V
MIN
)
Minimum
Horizontal Run (H
MIN
)
Maximum
Horizontal Run (H
MAX
)
90° elbow
6 in
152 mm
14 ft
4.27 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
F
F
C
D
E
A
B
D
A
B
H
MIN
H
MAX
3ft (914mm) MIN / 50ft (15.2m) MAX
90° ELBOW + 6 in (152mm) H
MIN
/ 14 ft (4.27m) H
MAX
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
Figure 7.2, Combination Venting
