8
Initial Installation
QUALIFIED INSTALLERS ONLY
STRAIGHT VERTICAL INSTALLATION:
Figure 5: Straight vertical installation.
This basic venting conguration 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 feet (3.0 m) to 30
feet (9.1 m). The total horizontal length depends on
the number of elbows used; a 90° elbow accounts for
5 feet (1.5 m) of the horizontal run.
The venting should never slope down, a minimum
inch (0.6 cm) rise is needed for every 2 feet (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.
Number of 90° elbows Maximum total horizontal
length allowed
2 20 feet (6.1 m)
3 13 feet (4.0 m)
4 6 feet (1.8 m)
5 0 feet (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 foot (0.31
m) from the top of the unit before any horizontal run
are used.
Table 1. 90° elbows allowed verses the
horizontal length.