Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 15

bGD36CF REAR EXIT / HORIzONTAL TERMINATION
when (H ) > (V )
T T
Simple venting configuration (only two 90° elbows)
FIGURE 27
See graph to determine the required vertical rise V
required horizontal run H
T
required
vertical
rise in
inches
V
T
horizontal vent run Plus offsets in feet
The shaded area within the lines represents acceptable
values for H and V .
T T
For vent configurations requiring more than two 90° elbows
the following formulas apply:
Formula : H < 3.5V
T
Formula : H + V < 24.75 feet
T T
for the
T
T
Example 5:
H
1
V
= 4 ft
1
V
= .5 ft
2
V = V + V
T 1 2
H
=  ft
1
H
=  ft
2
H
=  ft
3
H
= .5 ft
4
H = H + H
R 1 2
H
= .0(four 90° elbows + one 45° elbow - 90°)
O
= .0(90 + 90 + 90 + 90 + 45 - 90) = 9.45 ft
H = H + H
T R
H + V
= 4.95 + 5.5 = 0.45 ft
T T
H < 3.5V
Formula :
T
H
T
4.95 < 9.5
H + V
Formula :
T
0.45 < 4.75
Since both formulas are met, this vent configuration is
acceptable.
90°
H
90°
V
2
45°
H
2
H
V
3
1
FIGURE 28
90°
= 4 + .5 = 5.5 ft
+ H + H =  +  +  + .5 = 5.5 ft
3 4
= 5.5 + 9.45 = 4.95 ft
O
T
3.5V = .5 x 5.5 = 9.5 ft
T
< 24.75 feet
T
W45-0566 / A / 07..06
5
4
90°