Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 17

bGD42CF HORIzONTAL TERMINATION
when (H ) > (V )
T T
Simple venting configuration (only one 45º and 90° elbow)
See graph to determine
the required vertical rise
V for the required hori-
T
zontal run H .
T
FIGURE 31
required
vertical
rise in
inches
V
T
horizontal vent run Plus offsets in feet
(h )
t
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 < 4.2 VT
Formula 2: HT + VT < 24.75 feet
Example 2:
H
45°
V
1
V
= 4 ft
1
V
= .5 ft
2
V = V + V
= 4 + .5 = 5.5 ft
T 1 2
H
=  ft
1
H
=  ft
2
H
=  ft
3
H
= .5 ft
4
H = H + H + H + H
R 1 2 3
H
= .0(one 450° elbow + three 90° elbows - 5°)
O
= .0(5 - 5) = 5.4 ft
H = H + H
= 5.5 + 5.4 = 0.9 ft
T R O
H + V
= 0.9 + 5.5 = 6.4 ft
T T
H < 4.2V
Formula :
T
4.V
T
0.9 < 6.8
H + V < 24.75 feet
Formula :
T T
6.4 < 4.75
Since both formulas are met, this vent configuration is
acceptable.
90°
90°
H
1
3 V
2
H
90°
2
FIGURE 32
=  +  +  + .5 = 5.5 ft
4
T
= 4. x 5.5 = . ft
W45-0566 / A / 07..06
7
H
4