Elbow Vent Length Values; Top Exit Horizontal Termination - Napoleon BGD36CFNTR Installation And Operating Instructions Manual

14
3.7

ELBOW VENT LENGTH VALUES

FEET
1° 0.03
EN
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°
3.8

TOP EXIT HORIZONTAL TERMINATION

Simple venting confi guration (only one 90° elbow)
For vent confi gurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
Formula 2: H
Example:
= 3 FT (0.9m)
V
1
= 8 FT (2.4m)
V
2
= V + V
V
T 1
= 2.5 FT (0.8m)
H
1
= 2 FT (0.6m)
H
2
= H + H
H
R 1
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.7m)
H
O
= H + H
H
T R
+ V = 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
H
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is acceptable.
W415-1132 / C / 08.20.13
INCHES MILLIMETERS
0.5 12.7
6.0 152.4
11.0 279.4
16.0 406.4
32.0 812.8
RISE IN FEET
(METERS)V
< V
T T
+ V < 40 feet (12.2m)
T T
= 3 FT (0.9m ) + 8 FT (2.4m) = 11 FT (3.4m)
2
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
2
= 4.5 FT (1.4m) + 5.4 FT (1.6m) = 9.9 FT (3m)
O
H < V
T T
9.9 FT (3m) < 11 FT (3.4m)
H + V < 40 FT (12.2m)
T T
20.9 FT (6.4m) < 40 FT (12.2m)
(H ) < (V )
T T
See graph to determine the required vertical
rise V
40 (12.2)
39 (11.9)
REQUIRED
30 (9.1)
VERTICAL
20 (6.1)
T
10 (3.1)
0
2.5
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN
The shaded area within the lines represents
15.1A
for the required horizontal run H
T
5 7.5 10 12.5 15
(1.5) (2.3) (3.1) (3.8) (4.6)
FEET (METERS) H
T
acceptable values for H and V
T
90°
V
2
90°
H
90°
1
V
1
16.1B
.
T
17.5 20
(5.3) (6.1)
T
H
2