Napoleon GD33NR Installation And Operating Instructions Manual page 12

12
See graph to determine the required vertical rise V
required horizontal run H
MAXIMUM
VERTICAL
R I S E I N
FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H and V
T T
For vent confi gurations requiring more than two 90° elbow
(top exit) or one 90° elbow (rear exit), the following formulas
apply:
Formula 1: H
T
Formula 2: H + V
T
Example 4:
W415-0662 / A / 03.04.09
.
T
.
< 3V
T
< 40 feet
T
90°
H
V
1
H
90°
1
V
for the = 1.5 ft
T 1
V
= 5 ft
2
V = V
T 1
H
= 1 ft
1
H
= 1 ft
2
H
= 10.75 ft
3
H = H
R 1
H
= .03(three 90° elbows + one 45° elbow - 90°)
O
= .03(90 + 90 + 90 + 45 - 90) = 6.75 ft
H = H
H
T R
T
H + V
= 19.5 + 6.5 = 26 ft
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is
acceptable.
FIGURE 18
45°
2
H
3
+ V
= 1.5 + 5 = 6.5 ft
2
+ H + H
= 1 + 1 + 10.75 = 12.75 ft
2 3
+ H
= 12.75 + 6.75 = 19.5 ft
O
H < 3V
T T
3V
= 3 x 6.5 = 19.5 ft
T
19.5 = 19.5
H + V < 40 feet
T T
26 < 40
V
2
90°