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W415-0661 / C / 02.20.08
BGD42CF VERTICAL TERMINATION
when (H
T
) < (V
T
)
Simple venting confi gurations
45°
MAXIMUM
VERTICAL
RISE IN FEET
V
T
HORIZONTAL VENT
RUN PLUS OFFSET IN
FEET
H
T
The shaded area within the lines represents acceptable values
for H
T
and V
T
.
For vent confi gurations requiring more than one 45º and one 90°
elbow the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
Example 3:
90°
90°
90°
H
1
V
1
V
2
45°
H
2
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 45° elbow + three 90° elbows - 135°)
= .03 (45 + 90 + 90 +90 - 135) = 5.4 ft
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 ac-
ceptable.
See graph to determine the required vertical
rise V
T
for the required horizontal run H
T
.
FIGURE 38
FIGURE 39