THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE:
When venting cannot exit through the wall at a height greater than or equal to 12” (30.5 cm) from the ground or from the anticipated snow level, then the installation must be modified as shown below (see Figure 10). Refer to Table 9 for maximum venting lengths using 2” (5.1 cm) PVC or Table 10 for maximum lengths using 3” (7.6 cm) PVC.
Figure 10
NOTE: For installations requiring both horizontal and vertical runs, the
following rule must be followed: Total number of feet of straight pipe (both horizontally and vertically) must not exceed the allowable length listed in the “Through The Wall” section of the table for total number of elbows used. Also: Total number of vertical feet of straight pipe must not exceed the allowable length listed in the “Through The Roof” section of the table for total number of elbows used. For angular rises in venting, any angle that is greater than or equal to 45° from the horizontal should be considered a vertical rise.
Venting (Part II) continued-
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