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13
VENTING WITH TWO (2) 90
o
ELBOWS
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)
V+H+H
1
= 40' MAX.(12.4m)
20´ MAX. (6.2m)
V+V
1
+H
= 40' MAX.(12.4m)
Figure 8.
Venting with Two 90° Elbows
NOTE: There MUST be a 25% reduction
in total H when using flex vent.