Napoleon GDS25N GDS25P Installation And Operation Instructions Manual page 12

12
HORIZONTAL TERMINATION
when (H ) > (V )
T T
Simple venting confi guration (only one 45º and 90° elbow)
See graph to determine
the required vertical rise V
for the required horizontal
run H .
T
150
140
REQUIRED 130
VERTICAL
120
RISE IN
110
INCHES (V )
T
100
90
80
70
60
50
40
30
20
10
0
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET
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 90°
elbow the following formulas apply:
Formula 1: H < 4.2 V
T T
Formula 2: H + V < 24.75 feet
T T
W415-0547 / B / 05.08.06
T
FIGURE 7
5 10 15
Example 2:
H
FIGURE 8
45°
V
1
V
= 4 ft
1
V
= 1.5 ft
2
V = V + V
= 4 ft + 1.5 ft = 5.5 ft
T 1 2
H
= 2 ft
1
H
= 1 ft
2
H
= 1 ft
3
H
= 1.5 ft
4
H = H + H + H
R 1 2
H
= .03(one 45º elbow + three 90º elbow -135º)
O
=.03(315-135)=5.4ft
H = H + H
= 5.5 +5.4 = 10.9 ft
T R O
H + V
= 10.9 + 5.5 = 16.4 ft
T T
Formula 1: H < 4.2 V
T
4.2 V
10.9 < 16.8
Formula 2: H + V
T
20
16.4 < 24.75
Since both formulas are met, this vent confi guration is
acceptable.
90°
90°
H
1
V
3
2
H
2
90°
+ H
= 2 + 1 + 1 + 1. 5 = 5.5 ft
3 4
T
= 4.2 x 5.5 = 23.1 ft
T
< 24.75 feet
T
H
4