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1´ MIN. (305 mm) 2´ MAX. (610 mm) 5´ MAX. (1.52 m)
2´ MIN. (610 mm) 4´ MAX. (1.22 m) 10´ MAX. (3.1 m)
3´ MIN. (914 mm) 6´ MAX. (1.86 m) 15´ MAX. (4.65 m)
4´ MIN. (1.22 m) 8´ MAX. (2.48 m) 20´ MAX. (6.2 m)
V+H+H
1
+H
2
= 40´ MAX.(12.4 m) H=8´MAX.(2.48 m) H+H
1
+H
2
=20´ MAX. (6.2 m)
VENTING WITH THREE (3) 90° ELBOWS
V H H + H
1
+ H
2
1´ MIN. (305 mm) 2´ MAX. (610 mm) 5´ MAX. (1.52 m)
2´ MIN. (610 mm) 4´ MAX. (1.22 m) 10´ MAX. (3.1 m)
3´ MIN. (914 mm) 6´ MAX. (1.86 m) 15´ MAX. (4.65 m)
4´ MIN. (1.22 m) 8´ MAX. (2.48 m) 20´ MAX. (6.2 m)
V
1
+V+H+H
1
=40
´
MAX.(12.4m) H=8´MAX.(2.48m) H+H
1
=20´MAX.(6.2m)
VENTING WITH THREE (3) 90° ELBOWS
V H H + H
1
Figure 13. Venting with three 90° elbows