Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 14

4
bGD36CF REAR EXIT / HORIzONTAL TERMINATION
when (H ) < (V )
T T
Simple venting configuration (only two 90° elbows)
See graph to determine the required vertical rise V
FIGURE 25
required horizontal run H
For vent configurations requiring more than two 90° elbows
required
vertical
rise in
feet
V
T
horizontal vent run Plus offsets in feet
The shaded area within the lines represents acceptable
values for H and V
T T
the following formulas apply:
Formula : H < V
T
Formula : H + V
T
W45-0566 / A / 07..06
T
.
T
< 40 feet
T
Example 4:
for the
T
V
= 9 ft
1
V
= 6 ft
2
V = V + V
T 1
H
=  ft
1
H
=  ft
2
H
= .5 ft
3
H = H + H
R 1
H
H
= .0(four 90° elbows - 90°)
O
T
= .0(90 + 90 + 90 + 90 - 90) = 8. ft
H = H + H
T R
H + V
= 4.6 + 5 = 9.6 ft
T T
H
Formula :
4.6 < 5
H
Formula :
9.6 < 40
Since both formulas are met, this vent configuration is
acceptable.
90°
V
2
90°
H
2
V
1
H
1
90°
= 9 + 6 = 5 ft
2
+ H
=  +  + .5 = 6.5 ft
2 3
= 6.5 + 8. = 4.6 ft
O
< V
T T
+ V < 40 feet
T T
H
3
90°
FIGURE 26