R
CB1200-I Pellet Insert
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
WARNING
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.
Example of 3 Elbow-Rear Vent Termination Calculation
2 ft. | Pellet Venting | # of | Feet of | Multiplied | Equivalent | Components |
Component | Elbows | Pipe | By | Feet | Equivalent Feet | |
| 90o Elbow or Tee | 3 |
| X | 5 | 15 |
ft. | 45o Elbow |
|
| X | 3 |
|
Horizontal Pipe |
| 7 | X | 1 | 7 | |
| Vertical Pipe |
| 2 | X | 0.5 | 1 |
Total Equivalent Feet
23
2 ft.
2 ft. | Note: This is a generic example and is not |
| intended to represent any specific fuel type. |
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, 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.
30 |
| 4 in. (102mm) Diameter Pipe Only |
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20 |
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Equivalent Pipe |
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Length In Feet |
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10 |
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0 | 3 in. or 4 in. (76mm or 102mm) Diameter Pipe |
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2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||
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ALTITUDE IN THOUSANDS OF FEET
Figure 13.2
October 26, 2006 | Page 13 |
