Napoleon GDS28N Installation And Operating Instructions Manual page 18

18
Simple venting configurations.
For vent configurations requiring more than two 90° elbows the following formulas apply:
Formula 1: H < 3V
T
Formula 2: H + V
T
Example:
V = 2 FT
1
V = 1 FT
2
V = 1.5 FT
3
V = V + V + V = 2 + 1 + 1.5 = 4.5 FT
T 1 2 3
H = 6 FT
1
H = 2 FT
2
H = H + H = 6 + 2 = 8 FT
R 1 2
H = .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 FT
H = H + H = 8 + 8.1 = 16.1 FT
T R O
H + V = 16.1 + 4.5 = 20.6 FT
T T
Formula 1: H
16.1 > 13.5
Since this formula is not met, this vent configuration is unacceptable.
Formula 2: H
20.6 < 40
Since only formula 2 is met, this vent configuration is unacceptable and a new appliance location or vent configuration will
need to be established to satisfy both formulas.
W415-0153 / E / 05.28.12
T
< 40 feet
T
< 3V
T T
3V = 3 x 4.5 = 13.5 FT
T
+ V < 40 feet
T T
(H ) > (V )
T T
See graph to determine the required vertical rise V
20
19
REQUIRED
VERTICAL
RISE IN
10
FEET V
T
3
0
5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
90°
required horizontal run H
10 15 20
values for H and V
T T
90°
H
V
V
1
2
1
90°
18.1_2A
for the
T
.
T
25 30
T
V
3
H
2
90°