Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 20

0
when (H ) < (V )
T T
Simple venting configurations
FIGURE 38
See graph to determine the required vertical rise V
required horizontal run H
maximum
vertical
r i s e i n
feet
V
T
horizontal vent run Plus offset in feet
The shaded area within the lines represents acceptable
values for H and V
T T
For vent configurations requiring more than one 45º and
one 90° elbow the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
W45-0566 / A / 07..06
bGD42CF VERTICAL TERMINATION
.
T
.
Example 8:
FIGURE 39
45°
V
= 5 ft
1
for the
T V
= 0 ft
2
V = V + V
T 1
H
=  ft
1
H
= .5 ft
2
H = H + H
R 1
H
= .0 (one 45° elbow + three 90° elbows - 5°)
O
= .0 (45 + 90 + 90 +90 - 5) = 5.4 ft
H = H + H
T R
H + V
= 0.9 + 5 = 5.9 ft
T T
H
Formula :
0.9 < 5
H
Formula :
5.9 < 40
Since both formulas are met, this vent configuration is
acceptable.
H
T
90°
V
1
45°
H
90°
1
= 5 + 0 = 5 ft
2
=  + .5 = 5.5 ft
2
= 5.5 + 5.4 = 0.9 ft
O
< V
T T
+ V < 40 feet
T T
V
2
H
2
90°