14
14
Minimum
Maximum
A:
From
fl
oor to top of vent duct
3’-7
9
⁄
16
”
(111 cm)
9’-1
9
⁄
16
”
(278 cm)
B:
Frame front face to outside
wall
-
11’4”
(345 cm)
C:
Frame front face to inside
wall
16”
(40.6 cm)
-
D:
Vertical pipe run between
elbows
6”
(15.2 cm)
6’
(183 cm)
E:
Total horizontal pipe run from
elbow (including terminal
pipe)
-
10’
(305 cm)
with no
elbow in
horizontal
run
F:
Clearance to combustible
materials above horizontal
pipe run inside building
(Outside wall shields/
thimbles)
1”
(2.5 cm)
-
G:
Clearance to combustible
materials below horizontal
pipe run
1-
5
⁄
16
”
(3.3 cm)
-
H:
Clearance to combustible
materials all round vertical
pipe run and at sides of
horizontal pipe run
2”
(5.1 cm)
-
Top Vent Connection—Horizontal Rear
Termination
See
fi
gure 12.
Can be used with either #551DVK standard vent kit or
another terminal cap and accessories.
Adapter #817VAK, one 90º vent elbow and pipe lengths will
be required. See venting accessories list on pages 39–40 for
allowable components.
The location requirements are shown in the table and graph
below and figure 12.
14” (36 cm) max.
combustible wall
A
B
C
D
E
F
G
H
1
0
2
3
4
5
6
1
2
3
4
5
6
7
8
9
10
FORBIDDEN VENT PIPE
COMBINATIONS
Example b
Example a
ALLOWED VENT PIPE
COMBINATIONS
Maximum Horizontal Run (Ft) (E in Fig. 12)
Vertical
Rise (Ft)
(D in Fig. 12)
Figure 12
Graph 2
For installations with a horizontal rear termination, the
combination of horizontal and vertical vent pipes must
be within the allowed area shown in Graph 2. A minimum
vertical pipe run of 6” is necessary.
Example a: If a vertical rise of 2’6” is required, the horizontal
run must not be more than 8’.
Example b: If a horizontal run of 3’6” is required, the vertical
run must be at least 1’3”.
The horizontal vent pipe run may be redirected by using
elbows up to a total of 180° but the maximum horizontal
run (E in
fi
gure 7 & graph 1) is reduced by 18” for every
45°. For example, if two 90° elbows are used as in
fi
gure 13, the maximum horizontal run is reduced by 3’
per elbow—total reduction = 6’.
Max. Horizontal run (A + B + C)
reduced by 3’ per elbow
C
A
B
Figure 13
!
Location
