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90°
V
90°
H
V
1
V and H are measured from the center of the vent elbows
This example represents a vent that has a maximum of three 90º elbows, a combined horizontal vent length (H ) of
10 feet and a combined vertical vent length (V ) of 8 feet.
Since the vent is located in the dark shaded area, it is within the acceptable vent configuration
40'
30'
H
2
2
V
20'
1
15'
Base of
air collar
10'
V
1
0'
Base of
air collar
minimum venting requirements
1-3 elbow zone
H
H
1
5'
5'
0'
V = V
+ V
= 8 ft
1
2
H = H
+ H
= 10 ft
1
2
2
V
2
10'
15'
H
W415-1710 / A / 07.27.17
EN
20'
21
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