Operating instructions

17
W415-0680 / 04.10.08
BCDV42CF HORIZONTAL TERMINATION
when (H
T
) < (V
T
)
Simple venting confi guration (only one 45º and 90° elbow)
REQUIRED VERTI-
CAL RISE IN FEET
(V
T
)
CALCULATED HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (H
T
)
The shaded area within the lines represents acceptable values for H
T
and V
T
.
45°
90°
FIGURE 34
For vent confi gurations requiring more than one 45º and 90° elbow, the following formulas apply:
Formula 1:
H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
Example 1:
45°
90°
H
1
H
2
V
1
FIGURE 35
V
1
= 8 ft
V
T
V
1
= 8 ft
H
1
= 2.5 ft
H
2
= 2 ft
H
R
= H
1
+ H
2
= 2.5 + 2 = 4.5 ft
H
O
= .03 (one 45° elbows + two 90° elbows - 135°)
= .03(225 - 135°) = 2.7 ft
H
T
= H
R
+ H
O
= 4.5 + 2.7 = 7.2 ft
H
T
+ V
T
= 7.2 + 8 = 15.2 ft
Formula 1: H
T
< V
T
7.2 < 8
Formula 2: H
T
+ V
T
< 40 feet
15.2 < 40
Since both formulas are met, this vent confi guration is ac-
ceptable.
when (H
T
) > (V
T
)
Simple venting confi guration (only one 45º and 90° elbow)
See graph to determine the required vertical rise V
T
for the required horizontal run H
T
.
REQUIRED VERTICAL
RISE IN INCHES
V
T
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (H
T
)
The shaded area within the lines represents acceptable values for H
T
and V
T
.
FIGURE 36