15
s
tRaight
V
eRticaL
i
nstaLLation
:
Figure 15: Straight vertical installation.
This basic venting configuration shown are rough
guidelines only. Follow national and local codes for
other installation options.
For the best venting performance, we recommend a
total vent height in the range of 10 ft (3.0 m) to 30
ft (9.1 m). The total horizontal length depends on the
number of elbows used; a 90° elbow accounts for 5 ft
(1.5 m) of the horizontal run.
The venting should never slope down, a minimum ¼
inch (0.6 cm) rise is needed for every 2 ft (61 cm) of
horizontal is recommended.
If practical, it is best to locate the appliance to permit
the use of shorter horizontals and fewer elbows.
Table 2. 90° elbows allowed verses the horizontal length.
Number of 90°
elbows
Maximum total horizontal
length allowed
2
20 ft (6.1 m)
3
13 ft (4.0 m)
4
6 ft (1.8 m)
5
0 ft (0 m)
Note: Using two (2) 45° elbows is equivalent to using
one (1) 90° elbow.
The venting rise should be a minimum of 1 ft (31 cm)
from the top of the unit before any horizontal run are
used.
Initial Installation
QUALIFIED INSTALLERS ONLY
