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18
VENTING WITH THREE (3) 90° ELBOWS
V (FT.) H
(FT.)
1' MIN. (305mm) 5' MAX. (1.52m)
2' MIN. (610mm) 10' MAX. (3.1m)
3' MIN. (914mm) 15' MAX. (4.65m)
4' MIN. (1.22m) 20' MAX. (6.2m)
NOTE: H + H
1
= 20' MAX. (6.2m)
V + V
1
+ H + H
1
= 40' MAX. (12.4m)
V (FT.) H + H
1
(FT.)
1' MIN. (305mm) 5' MAX. (1.52m)
2' MIN. (610mm) 10' MAX. (3.1m)
3' MIN. (914mm) 15' MAX. (4.65m)
4' MIN. (1.22m) 20' MAX. (6.2m)
H +H
1
= 20' MAX. (6.2m)
NOTE: V+V
1
+H +H
1
= 40' MAX. (12.4m)
Figure 16. Venting with three 90° elbows
H
1
V
1
H
V