Napoleon GD36NTR Installation And Operation Instructions Manual page 10

10
DEFINITIONS
for the following symbols used in the venting calculations
and examples are:
> - greater than
> - equal to or greater than
< - less than
< - equal to or less than
H
- total of both horizontal vent lengths (H
T
(H ) in feet
O
H
- combined horizontal vent lengths in feet
R
H
- offset factor: .03(total degrees of offset - 90°*) in
O
feet
V
- combined vertical vent lengths in feet
T
TOP EXIT / HORIZONTAL TERMINATION
(H
Simple venting confi guration
(only one 90° elbow)
See graph to determine the required
vertical rise V
for the required hori-
T
zontal run H
.
T
40
38
REQUIRED
30
VERTICAL
RISE IN
FEET V
20
T
10
2
0
2.5
2
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
40
39.2
REQUIRED
30
VERTICAL
RISE IN
FEET V
20
T
10
.8
0
2.5
.8
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
values for H and V .
T T
W415-0210 / R / 02.27.08
NorthlineExpress.com
) and offsets
R
) < (V )
T T
FIGURE 6
GD36
5 7.5 10 12.5 15 17.5
BGD36
5 7.5 10 12.5 15 17.5
http://www.northlineexpress.com
ELBOW VENT LENGTH VALUES
1°
15°
30°
45°
90°*
* the fi rst 90° offset has a zero value and is shown in the
formula as -90°
For vent confi gurations requiring more than one 90° elbow,
the following formulas apply:
Formula 1: H
T
Formula 2: H
T
FIGURE 7
Example 1:
V
= 3 ft
1
V
= 8 ft
2
20
V = V + V
= 3 + 8 = 11 ft
T 1 2
H
T = 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 ft
O
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
20
H + V
Formula 2:
T
T
20.9 < 40
Since both formulas are met, this vent confi guration is
acceptable.
feet inches
0.03 0.5
0.45 6.0
0.9 11.0
1.35 16.0
2.7 32.0
< V
T
+ V < 40 feet
T
90°
V
2
90°
H
90°
1
V
1
T
< 40 feet
T
Toll-Free 1-866-667-8454
H
2