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Septemer 1, 2008 7014-083E Page 13

CB1200-I Pellet Insert
3 in. or 4 in. (76mm or 102mm) Diameter Pipe
Equivalent Pipe
Length In Feet

ALTITUDE IN THOUSANDS OF FEET

0
20
30
1 2 3 4 5 6 7 8 9 10
4 in. (102mm) Diameter Pipe Only
10
Example 1
Example 2
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.
WARNING
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, 3 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.
D. Pipe Selection Chart
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.
C. Equivalent Feet of Pipe
2 ft.
2 ft.

3 ft.

2 ft.
Example of 3 Elbow-Rear Vent Termination Calculation
Figure 13.1

Figure 13.2

Pellet Venting
Component
# of
Elbows
Feet of
Pipe
Multiplied
By
Equivalent
Feet
Components
Equivalent Feet
90o Elbow or Tee 3X515
45o Elbow X3
Horizontal Pipe 7X 17
Vertical Pipe 2X 0.5 1
Total Equivalent Feet 23

Note: This is a generic example and is not

intended to represent any specific fuel type.

Example 1: If the equivalent length of pipe is 23 feet with altitude of

8,000 feet you must use 4 inch (102mm) diameter type “L” or “PL”

vent.

Example 2: If the equivalent length of pipe is 12 feet with altitude of

6,000 feet you may use 3 or 4 inch (76 to 102mm) diameter type “L”

or “PL” vent

Fire Risk.
Do NOT pack insulation or other combustibles between firestops.
• ALWAYS maintain specified clearances around venting and firestop systems.
• Install firestops as specified.
Failure to keep insulation or other material away from vent pipe may cause fire.
WARNING