Napoleon LHD45N Installation And Operating Instructions Manual page 15

NOTE: There MUST be a 25% reduction in total horizontal length (H
Simple venting configuration (only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H < 4.2 V
T T
Formula 2: H + V < 24.75 feet (7.5m)
T T
Example:
V = V = 6 FT (1.8m)
1 T
H = 3 FT (0.9m)
1
H = 5 FT (1.5m)
2
H = H + H = 3FT (0.9m) + 5FT (1.5m) = 8FT (2.4m)
R 1 2
H = .03 (two 90° elbows - 90°) = .03 (180° - 90°) = 2.7FT (0.8m)
O
H = H + H = 8FT (2.4m) + 2.7FT (0.8m) = 10.7FT (3.3m)
T R O
H + V = 10.7FT (3.3m) + 6FT (1.8m) = 16.7FT (5.1m)
T T
Formula 1: H < 4.2 V
T T
4.2 V
10.7 FT (3.3m) < 25.2FT (15.9m)
Formula 2: H + V < 24.75 FT
T T
16.7FT (3.3m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
Example:
V = 4 FT (1.2m)
1
V = 1.5 FT (0.5m)
2
V = V + V = 4FT (1.2m) + 1.5FT (0.5m) = 5.5FT (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 + H = 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5FT (1.7m)
R 1 2 3 4
H = .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT (2.5m)
O
H = H + H = 5.5FT (1.7m) + 8.1 FT (2.5m) = 13.6 FT (14.2m)
T R O
H + V = 13.6 FT (14.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
T T
Formula 1: H < 4.2 V
T T
4.2 V
13.6 (4.1m) < 23.1 FT (7m)
Formula 2: H + V < 24.75 FT (7.5m)
T T
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
(H
T
REQUIRED
VERTICAL RISE
IN INCHES
(MILLIMETERS)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS)H
= 4.2 FT (1.3m) x 6 FT (1.8m) = 25.2FT (15.9m)
T
= 4.2 FT (1.3m) x 5.5 FT (1.7m) = 23.1 FT (7m)
T
) when using fl ex vent.
T
) > (V )
T
See graph to determine the required vertical rise V
required horizontal run H
150 (3810)
147 (3733.8)
100 (2540)
V
57 (1447.8)
T
50 (1270)
8 (203.2)
0 5
(1.5)
2
(0.6)
The shaded area within the lines represents acceptable
values for H
90°
V
1
H
90°
V
1
for the
T
.
T
15
10 20 (6.1)
(4.6)
(3.1)
12.5 19.5
(3.8) (5.9)
and V
T T
H
1
H
2
90°
90°
90°
H
1
V
2
H
H
2
3
90°
16.8 A
W415-0834 / E / 06.13.13
15
EN
T
4