Napoleon GDS60N Installation And Operating Instrictions page 19

Simple venting configuration
(only two 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H < 3.5V
T
Formula 2: H + V
T
Example 4:
V = 4 FT
1
V = 1.5 FT
2
V = V + V = 4 + 1.5 = 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 (four 90° elbows + one 45° elbow - 90°)
O
= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT
H = H + H = 5.5 + 9.45 = 14.95 FT
T R O
H + V = 14.95 + 5.5 = 20.45 FT
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
NorthlineExpress.com
T
< 24.75 feet
T
+ H = 2 + 1 + 1 + 1.5 = 5.5 FT
3 4
H < 3.5V
T T
3.5V = 3.5 x 5.5 = 19.25 FT
T
14.95 < 19.25
H + V < 24.75 FT
T T
20.45 < 24.75
http://www.northlineexpress.com
(H ) > (V )
T T
See graph to determine the required vertical rise V
required horizontal run H
150
147
REQUIRED
VERTICAL
100
RISE IN
INCHES V
T
66
50
12
0
2.5
1 3.5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
H
.
T
5 7.5 10 12.5 15
values for H and H
T T
90°
H
3
V
2
90°
H
2
90°
V
1
1
90°
16.3_2
W415-0788 / 05.15.09
Toll-Free 1-866-667-8454
19
for the
T
17.5 20
19.25
T