40
39
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37
36
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34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1 2
3 4 5 6 7 8 9 10 11 12 13 14
HORIZONTAL RUN
ft
VER
TIC
AL RISE
INSTALLATION
PROHIBITED
INSTALLATION
PROHIBITED
Figure 32.1 Possible Vent Configurations for Top
Vented Vertical and Horizontal Terminations.
Initial Installation
QUALIFIED INSTALLERS ONLY
a
LLowabLe
v
ent
c
onfiguRations
:
Figures 32.1 & 32.2 show the range of possible vent configurations if the unit is top or rear vented, for
vertical and horizontal terminations. Any layout that remains within the shaded areas is acceptable. Having
the fewest number of elbows is ideal, as they tend to disrupt air movement. Using 45˚ elbows is preferable
to using 90˚ elbows. Also, a shorter vent system will perform better than a longer one. When top vented,
the total length of horizontal vent pipe can not exceed 14 feet (4.27m) and the total vent length can
not exceed 44ft (13.4m). Any combination
of rise and run can be used as long as it
lays within the shaded area (a total of two
(2) 90
˚
elbows or four (4) 45
˚
elbows can
be used. In addition to what is shown, if a
90
˚
elbow is used in the horizontal plane,
3 feet (91.4cm) must be subtracted from
the allowable horizontal run (for each 45
˚
elbow, 1½ feet must be subtracted).
Note: Air restrictors (supplied with the unit)
may be required for vertical venting runs
of 8ft (2.44m) or taller. See
a
Ir
r
estrIctor
s
ettIngs
for more information
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1 2 3 4 5 6 7 8 9
HORIZONTAL RUN
ft
INSTALLATION
PROHIBITED
1
2
3
4
5
6
1
2
3
4
5
7
VER
TIC
AL RISE
HORIZONTAL RUN
Figure 32.2 Possible Vent
Configurations for Rear Vented Vertical
and Horizontal Terminations.
27
