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3.8
HORIZONTAL TERMINATION
Simple venting confi guration (only one 45° and 90°
elbow)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example:
= 8 FT (2.4m)
V
1
= V
= 8 FT (2.4m)
V
T
1
= 2.5 FT (0.8m)
H
1
= 2 FT (0.6m)
H
2
= H
+ H
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
H
R
1
2
= .03 (one 45° elbow + two 90° elbows - 135°) = .03 (225 - 135°) = 2.7 FT (0.8m)
H
O
= H
+ H
= 4.5 FT (1.4m) + 2.7 FT (0.8m) = 7.2 FT (2.2m)
H
T
R
O
+ V
= 7.2 FT (2.2m) + 8 FT (2.4m) = 15.2 FT (4.6m)
H
T
T
Formula 1:
H
7.2 FT (2.2m) < 8 FT (2.4m)
Formula 2:
H
15.2 FT (4.6m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
REQUIRED
VERTICAL
RISE IN FEET
(METERS) V
T
< 40 feet (12.2m)
T
< V
T
T
+ V
< 40 FT (12.2m)
T
T
(H
) < (V
)
T
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
40 (12.2)
39 (11.9)
30 (9.1)
20 (6.1)
T
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
45°
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
1
H
1
90°
16.5A
W415-1146 / A / 02.16.13
15
EN
.
T
20
(6.1)
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