Napoleon GD33NR Installation And Operating Instructions Manual page 13

when (H ) < (V )
T T
Simple venting configurations
BGD34 / GD34
See graph to determine the required vertical rise V
required horizontal run H
T
REQUIRED
VERTICAL RISE
IN 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 configurations requiring more than zero 90° elbow
(top exit) or one 90° elbow (rear exit), the following formu-
las apply:
Formula 1: H < V
T T
Formula 2: H + V
T T
VERTICAL TERMINATION
FIGURE 15
BGD33 / GD33
T
.
< 40 feet
Example 6:
FIGURE 16
for the
V
= 5 ft
1
V
= 10 ft
2
V = V + V
T 1
H
= 3 ft
1
H
= 2.5 ft
2
H = H + H
R 1
H
= .03(three 90° elbows - 90°)
O
= .03(90 + 90 + 90 - 90) = 5.4 ft
H = H + H
T R
H + V
= 10.9 + 15 = 25.9 ft
T T
H
Formula 1:
T
10.9 < 15
H H H H H
H
Formula 2:
T T T T T
T
25.9 < 40
Since both formulas are met, this vent configuration is ac-
ceptable.
90°
H
V
1
H
1
90°
= 5 + 10 = 15 ft
2
= 3 + 2.5 = 5.5 ft
2
= 5.5 + 5.4 = 10.9 ft
O
< V
T
+ V < 40 feet
T
W415-0341 / K / 10.05.07
13
V
2
2
90°