Page 14
7014-188B
February 3, 2010
R
CB1200-I Pellet Insert
R
R
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 14.2.
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 14.1.
C. Equivalent Feet of Pipe
2 ft.
2 ft.
3 ft.
2 ft.
Example of 3 Elbow-Rear Vent Termination Calculation
Figure 14.1
Figure 14.2
Pellet Venting
Component
# of
Elbows
Feet of
Pipe
Multiplied
By
Equivalent
Feet
Components
Equivalent Feet
90
o
Elbow or Tee
3
X
5
15
45
o
Elbow
X
3
Horizontal Pipe
7
X
1
7
Vertical Pipe
2
X
0.5
1
Total Equivalent Feet
23
Note: This is a generic example and is not
intended to represent any specific fuel type.
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
Example 1
: If the equivalent length of pipe is 23 feet (7m)with altitude
of 8,000 feet (2438m) you must use 4 inch (102mm) diameter type “L”
or “PL” vent.
Example 2
: If the equivalent length of pipe is 12 feet (3.7m) with al
-
titude of 6,000 feet (1829m) you may use 3 or 4 inch (76 to 102mm)
diameter type “L” or “PL” vent
