Napoleon GD36NTR Installation And Instruction Manual page 20

20
Simple venting configuration
(only two 90° elbows)
EN
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H < 3.5V
T
Formula 2: H + V
T
Example:
V = 4 FT (1.2m)
1
V = 1.5 FT (0.5m)
2
V = V + V = 4FT (1.2m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
T 1 2
H = 2 FT (0.6m)
1
H = 1 FT (0.3m)
2
H = 1 FT (0.3m)
3
H = 1.5 FT (0.5m)
4
H = H + H +H
R 1 2 3
H = .03 (four 90° elbows + one 45° elbow - 90°)
O
= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT (2.9m)
H = H + H = 5.5FT (1.7m) + 9.45FT (2.9m) = 14.95FT (4.6m)
T R O
H + V = 14.95FT (4.6m) + 5.5FT (1.7m) = 20.45FT (6.2m)
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
W415-0773 / F / 08.26.13
T
< 24.75 feet (7.5m)
T
+H = 2FT(0.6m) + 1FT(0.3m) + 1FT(0.3m) + 1.5FT(0.5m) = 5.5 FT(1.7m)
4
H < 3.5V
T T
3.5V = 3.5FT (1.1m) x 5.5FT (1.7m) = 19.25FT (5.9m)
T
14.95 FT (4.6m) < 19.25 FT (5.9m)
H + V < 24.75 FT (7.5m)
T T
20.45 FT (6.2m) < 24.75 FT (7.5m)
(H ) > (V )
T T
See graph to determine the required vertical rise V
150(3810)
147 (3733.8
REQUIRED
VERTICAL RISE IN
100 (2540)
INCHES
(MILLIMETERS)V
T
66
(1676.4)
50 (1270)
12
(304.8)
0
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
required horizontal run H .
T
2.5 5 7.5 10 12.5
(0.8) (1.5) (2.3) (3.1) (3.8)
1 3.5
(0.3) (1.1)
values for H and H
T T
90°
V
2
90°
H
2
V
1
H
1
90°
16.3_2B
for the
T
15 17.5 20
(4.6) (5.3) (6.1)
19.25
(5.9)
T
H
3
90°