Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 13

bGD36CF TOP EXIT / HORIzONTAL TERMINATION
when (H ) > (V )
T T
Simple venting configuration (only one 90° elbow)
See graph to determine the
required vertical rise V for the
T
required horizontal run H .
T
required
vertical
rise in
inches
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 90° elbow the
following formulas apply:
Formula : H < 4. V
T T
Formula : h + v < 4.75 feet
t t
Example 2:
V
1
V = V
= 6 ft
1 T
H
=  ft
1
H
= 5 ft
2
H = H + H
=  + 5 = 8 ft
R 1 2
H
= .0(two 90° elbows - 90°) = .0(80° - 90°) = .7 ft
O
H = H + H
= 8 + .7 = 0.7 ft
T R O
H + V
= 0.7 + 6 =6.7
T T
H < 4.2 V
Formula :
T
4.2 V
0.7 < 5.
H + V < 24.75 feet
Formula :
T T
6.7 < 4.75
Since both formulas are met, this vent configuration is ac-
ceptable.
H
H
1
H
FIGURE 23
90°
T
= 4. x 6 = 5. ft
T
Example 3:
V
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 - 90°) = .0(60° - 90°) = 8. ft
O
H = H + H
T R
H + V
= .6 + 5.5 = 9. ft
T T
T
Formula : H < 4.2 V
T
.6 < .
Formula : H + V
T
9. < 4.75
Since both formulas are met, this vent configuration is
acceptable.
2
H
90°
1
V
H
2
90°
= 4 + .5 = 5.5 ft
+ H + H
=  +  +  + . 5 = 5.5 ft
3 4
= 5.5 + 8. = .6 ft
O
T
4.2 V
= 4. x 5.5 = . ft
T
< 24.75 feet
T
W45-0566 / A / 07..06

H
4
2
H
3
FIGURE 24