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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 17. Venting with three 90° elbows
H
1
V
1
H
V
NOTE: There MUST be a 25% reduction in
total H when using flex vent except when
using the simple up and out installation
(see Figure 6).