14
Figure 8. Venting with three 90° elbows
V
H
H + H
1
FT. (M)
FT. (M)
FT. (M)
4´ MIN. (1.22m) 2´ MAX. (.6m)
2´ MAX. (.6m)
20´ MAX. (6.2m)
20´ MAX. (6.2m)
Rise to Run up to 9 FT. Vertical: Ratio = 2:1
Rise to Run above 9 FT. Vertical: Ratio = 1:1
VENTING WITH THREE (3) 90° ELBOWS
V+V
1
= 20´ MAX. (6.2m)
H
H
1
V
1
V
V
H
H
1
V
1