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H
= 1 FT (0.3m)
2
H
= 1 FT (0.3m)
3
H
= 1.5 FT (0.5m)
4
H
= H
+ H
+ H
+ H
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
13.6 FT (4.2m) < 23.1 FT (7m)
Formula 2:
H
+ V
T
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
3.9
REAR EXIT HORIZONTAL TERMINATION
Simple venting configuration
(only two 90° elbows)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
< V
T
T
F
o
r
m
u
l
a
2
:
H
T
+
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
T
4.2 V
=4.2 FT (1.3m) x 5.5 FT (1.7m) = 23.1 FT (7m)
T
< 24.75 FT (7.5m)
T
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
horizontal run H
40 (12.2)
38.3 (11.7)
30 (9.1)
REQUIRED
VERTICAL
RISE IN
20 (6.1)
FEET
( METERS) V
T
10 (3.1)
1.6 (0.5)
2.5
0
(0.8)
1.6
(0.5)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable values for H
16.16
for the required
T
.
T
5
7.5
10
12.5
15
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
and H
T
90°
W415-1398 / C / 06.15.17
21
EN
17.5
20
(5.3)
(6.1)
T
T
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