Elbow Vent Length Values; Top Exit Horizontal Termination - Napoleon GRANDVILLE BGD36CFNTR Manuel D'installation Et D'utilisation

venting
EN
3.6

elbow vent length values

15° 0.45
30° 0.9
45° 1.35
90°* 2.7
* The fi rst 90° offset has a zero value and is shown in the formula as - 90°
* The fi rst 45° and° offset have a zero value and is shown in the formula as -45° and -90°
respectively or -135° when combined (for 45° exit only).
3.7

top exit horizontal termination

Simple venting configuration (only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H < V
T T
Formula 2: H + V < 40 feet (12.2m)
T T
Example:
V = 3 ft (0.9m)
1
V = 8 ft (2.4m)
2
V = V + V = 3 ft (0.9m) + 8 ft (2.4m) = 11 ft (3.4m)
T 1 2
H = 2.5 ft (0.8m)
1
H = 2 ft (0.6m)
2
H = H + H = 2.5ft (0.8m) + 2 ft (0.6m) = 4.5 ft (1.4m)
R 1 2
H = .03 (two 90° elbows - 90°) = .03 (180° - 90°) = 5.4 ft (1.7m)
O
H = H + H = 4.5 ft (1.4m) + 5.4 ft (1.6m) = 9.9 ft (3m)
T R O
H + V = 9.9 ft (3m) + 11 ft (3.4m) = 20.9 ft (6.4m)
T T
Formula 1: H < V
T T
9.9 ft (3m) < 11 ft (3.4m)
Formula 2: H + V
T T
20.9 ft (6.4m) < 40 ft (12.2m)
Since both formulas are met, this vent configuration is acceptable.
14
W415-1345 / D / 05.01.17
6.0 152.4
11.0 279.4
16.0 406.4
32.0 812.8
Required vertical
rise in feet
(meters) V
< 40 ft (12.2m)
(H ) ≤ (V )
T T
See graph to determine the required vertical rise V
the required horizontal run H
40 (12.2)
39 (11.9)
30 (9.1)
T
20 (6.1)
10 (3.1)
0
2.5 5
(0.8) (1.5)
Horizontal vent run plus offset in feet (meters) H
The shaded area within the lines represents acceptable
values for H
.
T
7.5 10 12.5 15 17.5
(2.3) (3.1) (3.8) (4.6) (5.3)
T
and V
T T
90°
H
2
V
2
90°
H
90°
1
V
1
for
T
20
(6.1)