Napoleon BGD36CFNTR Installation And Operation Manual page 15

SINGLE-SIDED
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 = 3 ft (0.9m) + 5 ft (1.5m) = 8 ft (2.4m)
R 1 2
H = .03 (two 90° elbows - 90°) = .03 (180° - 90°) = 2.7 ft (0.8m)
O
H = H + H = 8 ft (2.4m) + 2.7 ft (0.8m) = 10.7 ft (3.3m)
T R O
H + V = 10.7 ft (3.3m) + 6 ft (1.8m) = 16.7 ft (5.1m)
T T
Formula 1: H < 4.2 V
T T
4.2 V = 4.2 ft (1.3m) x 6 ft (1.8m) = 25.2 ft (7.7m)
T
10.7 ft (3.3m) < 25.2 ft (7.7m)
Formula 2: H + V < 24.75 ft (7.5m)
T T
16.7 ft (5.1m) < 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 = 4 ft (1.2m) + 1.5 ft (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 + H = 2 ft (0.6m) + 1 ft (0.3m) + 1 ft (0.3m) + 1.5 ft (0.5m) = 5.5 ft (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 = 5.5 ft (1.7m) + 8.1 ft (2.5m) = 13.6 ft (4.2m)
T R O
H + V = 13.6 ft (4.2m) + 5.5 ft (1.7m) = 19.1 ft (5.8m)
T T
Formula 1: H < 4.2 V
T T
4.2 V
T
13.6 ft (4.2m) < 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 ) > (V
T
Required vertical
rise in feet
(meters) V
= 4.2 ft (1.3m) x 5.5 ft (1.7m) = 23.1 ft (7m)
)
T
See graph to determine the required vertical rise V
the required horizontal run H
12.3 (3.8)
8.3 (2.5)
T
4.8 (1.5)
4.2 (1.3)
1.6 (5)
0
5
(1.5)
2
(0.6)
Horizontal vent run plus offset in feet (meters) H
The shaded area within the lines represents acceptable
values for H
90°
V
1
H
90°
1
90°
V
1
venting
for
T
.
T
10 15 20 (6.1)
(3.1) (4.6)
19.5
12.5
(5.9)
(3.8)
T
and V
T T
H
1
H
2
90°
90°
90°
H
4
V
2
H
H
2
3
W415-1345 / D / 05.01.17
EN
15