Napoleon GDS25N GDS25P Installation And Operation Instructions Manual page 14

14
when (H ) > (V )
T T
Simple venting confi gurations
See graph to determine the required vertical rise V
FIGURE 11
required horizontal run H
.
T
For vent confi gurations requiring more than one 45º and one
90° elbow , the following formulas apply:
20
19
REQUIRED
VERTICAL
R I S E I N
10
FEET (V )
T
3
0
5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H and V .
T T
Formula 1: H < 3V
T
Formula 2: H + V
T T
Example 4:
V
= 1 ft
1
FIGURE 12
45°
H
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
H < 3V
Formula 1:
T T
3V
T
13.4 > 7.5
Since this formula is not met, this vent confi guration is
unacceptable.
W415-0547 / B / 05.08.06
VERTICAL TERMINATION
for the
T
10 15 20 25
T
< 40 feet
90°
V
2
H
2
V
1
90°
90°
= 3 x 2.5 = 7.5 ft
H + V
Formula 2:
T T
15.9 < 40
Since only formula 2 is met, this vent confi guration
is unacceptable and a new fi replace location or vent
confi guration will need to be established to satisfy both
formulas.
Example 5:
90°
45°
H
2
V
H
1
1
90°
V
= 1.5 ft
1
30
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
H + V
= 19.5 + 4.5= 29 ft
T T
H < 3V
Formula 1:
T
3V
19.5 < 28.5
H + V
Formula 2:
T T
29 < 40
Since both formulas are met, this vent confi guration is
acceptable.
< 40 feet
H
45°
3
FIGURE 13
= 1 + 1 + 10.75 = 12.75 ft
3
T
= 3 x 9.5 = 28.5 ft
T
< 40 feet
V
2
90°