Napoleon BGD48N Installation And Operation Instructions Manual page 13

when (H ) > (V )
T T
Simple venting confi gurations
FIGURE 12
See graph to determine the required vertical rise V
horizontal run H .
T
REQUIRED
VERTICAL
R I S E I N
FEET (V )
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (H
The shaded area within the lines represents acceptable values
for H and V .
T T
For vent confi gurations requiring more than one 45º and one 90°
elbow , the following formulas apply:
Formula 1: H < 3V
T T
Formula 2: H + V < 40 feet
T T
Example 4:
45°
VERTICAL TERMINATION
for the required
T
)
T
90°
H
V
1
H
2
V
1
90°
90°
FIGURE 13
V = 1 ft
1
V = 1.5 ft
2
V = V + V = 1 + 1.5 = 2.5 ft
T 1 2
H = 6 ft
1
H = 2 ft
2
H = H + H = 6 + 2 = 8 ft
R 1 2
H = .03 (one 45º elbow + three 90º elbow - 135º)
O
= .03(45 + 90 + 90 + 90 - 135) = 5.4 ft
H = H + H = 8 + 5.4 = 13.4 ft
T R O
H + V = 13.4 + 2.5 = 15.9 ft
T T
Formula 1: H < 3V
T
3V
13.4 > 7.5
Since this formula is not met, this vent confi guration is unac-
ceptable.
Formula 2: H + V
T
15.9 < 40
Since only formula 2 is met, this vent confi guration is unac-
ceptable and a new fi replace location or vent confi guration will
need to be established to satisfy both formulas.
Example 5:
90°
45°
H
1
V = 1.5 ft
1
V = 8 ft
2
V = V + V = 1.5 + 8= 9.5 ft
T 1 2
H = 1 ft
1
H = 1 ft
2
H = 10.75 ft
3
H = H + H + H
R 1 2
H = .03 (three 90° elbows + two 45° elbow - 135°)
O
= .03(90 + 90 + 90 + 45 + 45 - 135) = 6.75 ft
H = H + H = 12.75 + 6.75 = 19.5 ft
T R O
2
H + V = 19.5 + 4.5= 29 ft
T T
Formula 1: H < 3V
T
3V
19.5 < 28.5
Formula 2: H + V
T T
29 < 40
Since both formulas are met, this vent confi guration is accept-
able.
T
= 3 x 2.5 = 7.5 ft
T
< 40 feet
T
H
2
V
H
1
45°
3
90°
FIGURE 14
= 1 + 1 + 10.75 = 12.75 ft
3
T
= 3 x 9.5 = 28.5 ft
T
< 40 feet
W415-0326 / C / 11.23.07
13
V
2
90°