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 10 11 12 13 14
HORIZONTAL RUN
ft
VER
TIC
AL RISE
INSTALLATION
PROHIBITED
INSTALLATION
PROHIBITED
Figure 35. Possible Vent Configurations for Top
Vented Vertical and Horizontal Terminations.
Initial Installation
QUALIFIED INSTALLERS ONLY
a
llowable
c
o
-a
xial
v
ent
c
onfigurations
:
Figures 35 & 36 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) are required for vertical venting runs
of 8ft (2.44m) or taller. See
a
Ir
r
estrIctor
s
ettIng
s for more information
Note: Minimum length of co-linear venting
is 8ft (2.44m) and maximum length is 40ft
(12.19m)
28
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 36. Possible Vent Configurations
for Rear Vented Vertical and Horizontal
Terminations.
