Initial Installation
QUALIFIED INSTALLERS ONLY
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 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 1⁄4 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.
Table 1. 90° elbows allowed verses the
horizontal length.
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.
Figure 5: Straight vertical installation.
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