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Simple venting confi guration (only one 45° and 90°
elbow)
f i r e - p a r t s . c o m
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
< 4.2 V
T
Formula 2: H
+ V
T
Example:
= 4 FT
V
1
= 1.5 FT
V
2
= V
+ V
= 4 FT + 1.5 FT = 5.5 FT
V
T
1
2
= 2 FT
H
1
= 1 FT
H
2
= 1 FT
H
3
= 1.5 FT
H
4
= H
+ H
+ H
H
R
1
2
= .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT
H
O
= H
+ H
= 5.5 + 8.1 = 13.6 FT
H
T
R
O
+ V
= 13.6 + 5.5 = 19.1 FT
H
T
T
Formula 1:
H
Formula 2:
H
19.1 < 24.75
Since both formulas are met, this vent confi guration is acceptable.
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T
< 24.75 feet
T
+ H
= 2 + 1 + 1 + 1.5 = 5.5 FT
3
4
< 4.2 V
T
T
= 4.2 x 5.5 FT = 23.1 FT
4.2 V
T
13.6 < 23.1
+ V
< 24.75 FT
T
T
(H
) > (V
)
T
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
REQUIRED
VERTICAL
RISE IN
INCHES V
T
The shaded area within the lines represents
acceptable values for H
90°
V
150
147"
100
57"
50
0
5
15
10
12.5'
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET H
and V
T
90°
90°
H
3
V
H
1
H
2
90°
1
45°
16.5_2
W415-1028 / A / 08.13.12
15
.
T
20
T
T
H
4
2
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