Napoleon Bayfield GDS25P Installation And Operation Instructions Manual page 13

when (H ) < (V )
T T
FIGURE 9
See graph to determine the required vertical rise V
required horizontal run H
.
T
REQUIRED VERTICAL RISE
IN FEET (V )
T
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 < V
T
Formula 2: H + V
T T
VERTICAL TERMINATION
45°
for the
T
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0 5 10 15
HORIZONTAL VENT RUN
PLUS OFFSETS IN FEET
T
< 40 feet
Example 3:
FIGURE10
45°
H
1
V
= 5 ft
1
V
= 10 ft
2
V = V + V
= 5 + 10 = 15 ft
T 1 2
H
= 3 ft
1
H
= 2.5 ft
2
H = H + H
= 3 + 2.5 = 5.5 ft
R 1 2
H
= .03(one 45º elbow + three 90º elbows - 135º)
O
= .03(45+90+90+90-135)=5.4
H = H + H
= 5.5 + 5.4 = 10.9 ft
T R O
H + V
= 10.9 + 15 = 25.9 ft
T T
H < V
Formula 1:
T
10.9 < 15
H + V
20
Formula 2:
T T
25.9 < 40
Since both formulas are met, this vent confi guration is
acceptable.
V
2
90°
H
2 90°
V
1
90°
T
< 40 feet
W415-0547 / C / 07.25.06
13