Operating instructions

15
W415-0680 / 04.10.08
BCDV36CF(G) TOP OR REAR EXIT VERTICAL TERMINATION
REQUIRED VERTI-
CAL 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
.
See graph to determine the required vertical rise V
T
for the required horizontal run H
T
when (H
T
) < (V
T
)
Simple venting confi guration (only two 90° elbows)
FIGURE 29
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 (three 90° elbows - 90°)
=.03(90 + 90 + 90 - 90) = 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
Since both formulas are met, this vent confi guration is acceptable.
For vent confi gurations requiring more than zero 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
Example 6:
90°
90°
90°
H
1
H
2
V
1
V
2
FIGURE 30
Formula 2: H
T
+ V
T
< 40 feet
25.9 < 40