Napoleon GD34-1NT Installation And Operating Instructions Manual page 10

10
For vent confi gurations requiring more than one 90° elbow,
the following formulas apply:
Formula 1: H
T
Formula 2: H + V
T
Example 1:
FIGURE 10
90°
V
1
V
= 3 ft
1
V
= 8 ft
2
V = V + V
= 3 + 8 = 11 ft
T 1 2
H
= 2.5 ft
1
H
= 2 ft
2
H = H + H
= 2.5 + 2 = 4.5 ft
R 1 2
H
= .03(three 90° elbows - 90°) = .03(270° - 90°) = 5.4
O
ft
H = H + H
= 4.5 + 5.4 = 9.9 ft
T R O
H + V
= 9.9 + 11 = 20.9 ft
T T
H < V
Formula 1:
T
9.9 < 11
H + V
Formula 2:
T
20.9 < 40
Since both formulas are met, this vent confi guration is
acceptable.
W415-0663 / A / 01.07.08
< V
T
< 40 feet
T
90°
V
2
90°
H
1
T
< 40 feet
T
Simple venting confi guration
(only one 90° elbow)
FIGURE 11
H
2
See graph to determine
the required vertical
rise V
for the required
T
horizontal run H
The shaded area within
t h e l i n e s r e p r e s e n t s
acceptable values for H
and V .
T
For vent confi gurations requiring more than one 90° elbow
the following formulas apply:
Formula 1: H
Formula 2: H
Example 2:
V
1
(H ) > (V )
T T
.
T
150
140
130
120
REQUIRED
110
100
VERTICAL
90
RISE IN
80
INCHES
70
V
60
T
50
40
30
24
20
10
0 5
2
HORIZONTAL VENT RUN
PLUS OFFSET IN FEET
2
150
140
130
120
REQUIRED
110
VERTICAL
100
RISE IN 90
80
INCHES
70
V
60
T
50
40
30
20
10
0 5
T
HORIZONTAL VENT RUN
PLUS OFFSET IN FEET
< 4.2 V
T T
+ V < 24.75 feet
T T
H
1
90°
FIGURE 12
GD34-1
10 15 20
BGD34 1
H
T
BGD34-1
10 15 20
H
T
H
2