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14
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
f i r e - p a r t s . c o m
apply:
Formula 1: H
T
Formula 2: H
T
Example:
= 8 FT
V
1
= V
= 8 FT
V
T
1
= 2.5 FT
H
1
= 2 FT
H
2
= H
+ H
H
R
1
2
= .03 (one 45° elbow + two 90° elbows - 135°) = .03 (225 - 135°) = 2.7 FT
H
O
= H
+ H
H
T
R
O
+ V
= 7.2 + 8 = 15.2 FT
H
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is acceptable.
W415-1028 / A / 08.13.12
All manuals and user guides at all-guides.com
< V
T
+ V
< 40 feet
T
= 2.5 + 2 = 4.5 FT
= 4.5 + 2.7 = 7.2 FT
H
< V
T
T
7.2 < 8
H
+ V
< 40 FT
T
T
15.2 < 40
(H
) < (V
)
T
T
See graph to determine the required vertical
rise V
T
40
39
30
REQUIRED
VERTICAL
20
RISE IN
FEET V
T
10
0
2.5
HORIZONTAL VENT RUN PLUS OFFSET IN
The shaded area within the lines represents
acceptable values for H
45°
for the required horizontal run H
5
7.5
10
12.5
15
FEET H
T
and V
T
90°
V
1
H
1
90°
16.5
.
T
17.5
20
T
H
2
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