Elbow Vent Length Values; Top Exit Horizontal Termination - Napoleon Vittoria GD19N Installation And Operating Instructions Manual
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- Installation and operating instructions manual (112 pages) ,
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2.7
ELBOW VENT LENGTH VALUES
FEET INCHES
1°
0.03
0.5
15°
0.45
6.0
30°
0.9
11.0
45°
1.35
16.0
90°*
2.7
32.0
* The fi rst 90° offset has a zero value and is shown in the formula as - 90°
2.8
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
Formula 2: H
+ V
T
Example 1:
V
= 3 FT
1
V
= 8 FT
2
V
= V
+ V
= 3 + 8 = 11 FT
T
1
2
H
= 2.5 FT
1
H
= 2 FT
2
H
= H
+ H
= 2.5 + 2 = 4.5 FT
R
1
2
H
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT
O
H
= H
+ H
= 4.5 + 5.4 = 9.9 FT
T
R
O
H
+ V
= 9.9 + 11 = 20.9 FT
T
T
Formula 1:
H
9.9 < 11
Formula 2:
H
20.9 < 35
Since both formulas are met, this vent configuration is acceptable.
T
< 35 feet
T
< V
T
T
+ V
< 35 FT
T
T
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
required horizontal run H
40
35
30
REQUIRED
VERTICAL
20
RISE IN
FEET V
T
10
0
2.5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
15.1
.
T
5
7.5
10
12.5
15
values for H
and V
T
T
90°
V
2
90°
H
90°
1
V
1
16.6
W415-0825 / 07.06.09
15
for the
T
17.5
20
T
H
2
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