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W415-0536 / C / 09.06.06
vertical
rise in
feet
v
T
FIGURE 4
when (H
T
) < (v
T
)
(only one 90° elbow)
See graph to determine the required vertical rise v
T
for the
required horizontal run H
T
.
the following formulas apply:
Formula 1: H
T
< v
T
Formula 2: H
T
+ v
T
< 40 feet
Example 1:
v
1
= 3 ft
v
2
= 8 ft
v
T
=
v
1
+
v
2
=
3 + 8 = 11 ft
H
1
= 2.5 ft
H
2
= 2 ft
H
R
= H
1
+ H
2
= 2.5 + 2 = 4.5 ft
H
O
= .
03(three 90° elbows - 90°) = .03(270° - 90°) = 5.4 ft
H
T
= H
R
+ H
O
= 4.5 + 5.4 = 9.9 ft
H
T
+ v
T
= 9.9 + 11 = 20.9 ft
Formula 1: H
T
< v
T
9.9 < 11
Formula 2: H
T
+ v
T
< 40 feet
20.9 < 40
acceptable.
FIGURE 5
90°
90°
90°
H
1
v
2
H
2
v
1
horizontal vent run Plus offset in feet H
T
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
for the following symbols used in the venting calculations
and examples are:
> - greater than
> - equal to or greater than
< - less than
< - equal to or less than
H
T
- total of both horizontal vent lengths (H
R
) and offsets
(H
O
) in feet
H
R
- combined horizontal vent lengths in feet
H
O
- offset factor: .03(total degrees of offset - 90°*) in
feet
v
T
- combined vertical vent lengths in feet
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
*
formula as
DEFINITIONS
ELBOW vENT LENGTH vALUES
TOP EXIT / HORIzONTAL TERMINATION