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W415-0299 / J / 04.14.08
Example 3:
V
1
= 5 ft
V
2
= 10 ft
V
T
=
V
1
+
V
2
=
5 + 10 = 15 ft
H
1
= 3 ft
H
2
= 2.5 ft
H
R
= H
1
+ H
2
= 3 + 2.5 = 5.5 ft
H
O
= .03(one 45º elbow + three 90º elbows - 135º)
= .03(45+90+90+90-135)=5.4
H
T
= H
R
+ H
O
= 5.5 + 5.4 = 10.9 ft
H
T
+ V
T
= 10.9 + 15 = 25.9 ft
Formula 1: H
T
< V
T
10.9 < 15
Formula 2: H
T
+ V
T
< 40 feet
25.9 < 40
Since both formulas are met, this vent confi guration is
acceptable.
When (H
T
) < (V
T
)
Simple venting confi gurations
FIGURE 9
REQUIRED VERTICAL RISE IN
FEET (V
T
)
HORIZONTAL VENT RUN
PLUS OFFSETS IN FEET
(H
T
)
FIGURE 10
For vent confi gurations requiring more than one 45º and one
90° elbow , the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
See graph to determine the required vertical rise V
T
for the
required horizontal run H
T
.
90°
90°
V
1
H
1
H
2
V
2
45°
45°
90°
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
VERTICAL TERMINATION