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15
W415-0661 / C / 02.20.08
V
1
= 1.5 ft
V
2
= 5 ft
V
T
=
V
1
+
V
2
=
1.5 + 5 = 6.5 ft
H
1
= 1 ft
H
2
= 1 ft
H
3
= 10.75 ft
H
R
= H
1
+ H
2
+ H
3
= 1 + 1 + 10.75 = 12.75 ft
H
O
= .03 (three 90° elbows + one 45° elbow - 90°)
= .03(90 + 90 + 90 + 45 - 90) = 6.75 ft
H
T
= H
R
+ H
O
= 12.75 + 6.75 = 19.5 ft
H
T
+ V
T
= 19.5 + 6.5 = 26 ft
Formula 1: H
T
< 3V
T
3V
T
=
3 x
6.5 = 19.5 ft
19.5 < 19.5
Formula 2: H
T
+ V
T
< 40 feet
26 < 40
Since both formulas are met, this vent confi guration is accept-
able.
H
2
H
3
V
1
V
2
90°
45°
90°
H
1
90°
BGD36CF(G) TOP OR REAR EXIT VERTICAL TERMINATION
FIGURE 33
Example 8: