R
Castile 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.
Figure 14.1.
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 qualifi ed installer, service agency or your dealer.
Example of 3
2 ft.
3 ft.
2 ft.
Pellet Venting | # of | Feet of | Multiplied | Equivalent | Components | |
Component | Elbows | Pipe |
| By | Feet | Equivalent Feet |
90o Elbow or Tee | 3 |
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| X | 5 | 15 |
45o Elbow |
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| X | 3 |
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Horizontal Pipe |
| 7 |
| X | 1 | 7 |
Vertical Pipe |
| 2 |
| X | 0.5 | 1 |
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| Total Equivalent Feet | 23 | |
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| Note: This is a generic example and is not | |
2 ft. | |||
intended to represent any specifi c fuel type. | |||
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Figure 14.1
D. Pipe Selection Chart
The chart will help you in determing proper vent- ing size according to the equivalent feet of pipe calcuated above and the altitude above sea level of this installation. 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 required.
The chart reveals that a 90° elbow is 5 times as restrictive to the fl ow of exhaust gases under posi- tive 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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Example 1 |
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| 20 |
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Equivalent Pipe |
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Length In Feet |
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Example 2 | 10 |
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| 3 in. or 4 in. (76mm or 102mm) Diameter Pipe |
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| 0 |
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
ALTITUDE IN THOUSANDS OF FEET
Figure 14.2
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
Page 14 | August 20, 2009 |
