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3.6
DEFINITIONS
3.6
DEFINITIONS
For the following symbols used in the venting calculations and examples are:
For the following symbols used in the venting calculations and examples are:
> - greater than
> - greater than
EN
> - equal to or greater than
EN
> - equal to or greater than
< - less than
< - less than
< - equal to or less than
< - equal to or less than
H
- total of both horizontal vent lengths (Hr) and offsets (Ho) in feet
H
- total of both horizontal vent lengths (Hr) and offsets (Ho) in feet
T
H
- combined horizontal vent lengths in feet
T
H
- combined horizontal vent lengths in feet
R
H
- offset factor: .03 (total degrees of offset - 90°*) in feet
R
H
- offset factor: .03 (total degrees of offset - 90°*) in feet
O
V
- combined vertical vent lengths in feet
O
V
- combined vertical vent lengths in feet
T
T
3.7
ELBOW VENT LENGTH VALUES
3.7
ELBOW VENT LENGTH VALUES
FEET
FEET
1°
0.03
1°
0.03
15°
0.45
15°
0.45
30°
0.9
30°
0.9
45°
1.35
45°
1.35
90°*
2.7
90°*
2.7
* The fi rst 90° offset has a zero value and is shown in the formula as - 90°
* The fi rst 90° offset has a zero value and is shown in the formula as - 90°
3.8
TOP EXIT HORIZONTAL TERMINATION
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:
V
= 3 FT (0.9m)
1
V
= 8 FT (2.4m)
2
V
= V
+ V
T
1
H
= 2.5 FT (0.8m)
1
H
= 2 FT (0.6m)
2
H
= H
+ H
R
1
H
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.7m)
O
H
= H
+ H
T
R
H
+ V
= 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is acceptable.
W415-1613 / C / 12.22.16
W415-1613 / D / 09.20.17
INCHES
MILLIMETERS
INCHES
MILLIMETERS
0.5
12.7
0.5
12.7
6.0
152.4
6.0
152.4
11.0
279.4
11.0
279.4
16.0
406.4
16.0
406.4
32.0
812.8
32.0
812.8
RISE IN FEET
(METERS)V
REQUIRED
VERTICAL
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)
40 (12.2)
39 (11.9)
39 (11.9)
REQUIRED
30 (9.1)
REQUIRED
30 (9.1)
VERTICAL
VERTICAL
RISE IN FEET
20 (6.1)
20 (6.1)
(METERS)V
40 (12.2)
T
39 (11.9)
T
10 (3.1)
10 (3.1)
30 (9.1)
0
2.5
0
2.5
(0.8)
20 (6.1)
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN
HORIZONTAL VENT RUN PLUS OFFSET IN
T
10 (3.1)
The shaded area within the lines represents
0
2.5
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN
14.1
14.1
15.1A
15.1A
for the required horizontal run H
T
5
7.5
10
12.5
5
7.5
10
12.5
15
(1.5)
(2.3)
(3.1)
(3.8)
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
FEET (METERS) H
FEET (METERS) H
T
T
acceptable values for H
5
7.5
10
12.5
15
T
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
90°
90°
FEET (METERS) H
T
V
V
2
90°
90°
90°
V
90°
H
2
90°
V
V
1
90°
1
H
90°
1
V
1
16.1B
.
T
15
17.5
20
17.5
20
(4.6)
(5.3)
(6.1)
(5.3)
(6.1)
and V
17.5
20
T
(5.3)
(6.1)
H
H
2
2
2
H
2
H
1
1
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