Operating instructions
Determining Equivalent Pipe Length
To determine whether a
3"
or
4"
exhaust system is required for your installation, review the sample
~nstallation below.
Fill
out the top chart, and calculate your total equivalent pipe length. Afier you have
"!
the total equivalent pipe length, use the chart at the bottom of the page to determine if your installation
requires
3"
or
4"
exhaust pipe.
I
Type of Pipe
I
#
of Elbows or Feet of pipe
I
I
Equivalent Feet
I
Total Equivalent Feet
I
A-
90 Deg. Elbow
E-
8'
Vertical Pipe
B-
I'
Horizontal Pipe
F-
2'
Horizontal Pipe
C-
45
Degree Elbow
G-
90
Degree Tee
D-
Standoff Braces
H-
Wall Thimble
Pipe
Selection
Chart
-
30
--
------.
w
w
L
C
.-
4
INCH DIAMETER
ONLY
c,
20
c
a
4
n
6
10
-
C
(Y
-
3
OR
4
INCH DIAMETER
-
?
.-
z
I
=o
Altitude
in
Thousands of Feet
Sample Insfallation Chart
U
I
I
I
I
Type of Pipe
.
45" Elbows
(c)
Horizontal Pipe (B&F)
!
#
of Elbows or
Feet of pipe
Vertical Pipe
(E)
I
3
Equivalent Feet
I
'7
8
Total Equivalent Feet
x
x
x
3
ft.
(lm)
1
ft.
(.3m)
3
(lm)
3
(1m)
.5
ft.
(.15m)
4
(1.2m)