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R
R R
C. Equivalent Feet of Pipe
The table below can help you calculate the equivalent feet of
pipe which is a method used to determine pellet vent size. See
Figure 13.1
ft.
2 ft.
Figure 13.1
D. Pipe Selection Chart
The chart will help you in determing proper venting
size according to the equivalent feet of pipe calcuated
above and the altitude above sea level of this installa-
tion. See Figure 13.2.
Locate the calculated equivalent feet of pipe on
the vertical left side of the chart. Move to the right
horizontally on the chart until you reach your altitude
above sea level.
If you fall below the diagonal line, or 4 inch (76 to
102mm) pipe may be used. If it is anywhere above
the diagonal line, a 4 inch (102mm) diameter pipe is
requried.
The chart reveals that a 90° elbow is 5 times as
restrictive to the flow of exhaust gases under positive
pressure as 1 foot of horizontal pipe, and a foot of
horizontal pipe is twice as restrictive as a foot of
vertical pipe.
October 26, 2006
Example of 3 Elbow-Rear Vent Termination Calculation
2 ft.
2 ft.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. Refer
to the owner's information manual provided with this appli-
ance. For assistance or additional information consult a
qualified installer, service agency or your dealer.
Pellet Venting
# of
Feet of
Component
Elbows
Pipe
o
3
90
Elbow or Tee
o
45
Elbow
Horizontal Pipe
Vertical Pipe
Note: This is a generic example and is not
intended to represent any specific fuel type.
30
20
Equivalent Pipe
Length In Feet
10
3 in. or 4 in. (76mm or 102mm) Diameter Pipe
0
1
Figure 13.2
7014-083C
CB1200-I Pellet Insert
WARNING
Multiplied
Equivalent
By
Feet
X
5
X
3
7
X
1
0.5
2
X
Total Equivalent Feet
4 in. (102mm) Diameter Pipe Only
2
3
4
5
6
7
ALTITUDE IN THOUSANDS OF FEET
Components
Equivalent Feet
15
7
1
23
8
9
10
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