Operating instructions

13
W415-0680 / 04.10.08
See graph to determine the required vertical rise V
T
for the required horizontal
run H
T
For vent confi gurations requiring more than two 90° elbows the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
REQUIRED VER-
TICAL RISE IN
FEET V
T
HORIZONTAL VENT RUN PLUS
OFFSETS IN FEET H
T
Example 4:
V
1
= 9 ft
V
2
= 6 ft
V
T
= V
1
+ V
2
= 9 + 6 = 15 ft
H
1
= 3 ft
H
2
= 2 ft
H
3
= 1.5 ft
H
R
= H
1
+ H
2
+ H
3
= 3 + 2 + 1.5 = 6.5 ft
H
O
= .03 (four 90° elbows - 90°)
= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
H
T
= H
R
+ H
O
= 6.5 + 8.1 = 14.6 ft
H
T
+ V
T
= 14.6 + 15 = 29.6 ft
Formula 1: H
T
< V
T
14.6 < 15
Since both formulas are met, this vent confi guration is acceptable.
The shaded area within the lines represents acceptable values for H
T
and V
T
.
BCDV36CF(G) REAR EXIT / HORIZONTAL TERMINATION
when (H
T
) < (V
T
)
Simple venting confi guration (only two 90° elbows)
FIGURE 25
H
2
V
1
V
2
H
3
90°
90°
90°
90°
H
1
FIGURE 26
Formula 2: H
T
+ V
T
< 40 feet
29.6 < 40