R
CB 1200 Pellet Stove
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 11.1.
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 Calculaton
2 ft.
3 ft.
2 ft.
Pellet Venting | # of | Feet of | Multipled | 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 | |
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intended to represent any specific fuel type. | |||
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Figure 11.1 |
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D. Pipe Selection Chart |
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The chart will help you in determining proper |
| 30 | 4 in. (102mm) Diameter Pipe Only |
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venting size according to the equivalent feet of | Example 1 |
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pipe calculated above and the altitude above sea |
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level of this installation. Figure 11.2. |
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Equivalent Pipe |
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Locate the calculated equivalent feet of pipe on | Length In Feet |
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the vertical left side of the chart. Move to the | Example 2 | 10 |
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right horizontally on the chart until you reach |
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your altitude above sea level. |
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If you fall below the diagonal line, 3 or 4 inch (76 |
| 3 in. or 4 in. (76mm or 102mm) Diameter Pipe |
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to 102mm) pipe may be used. If it is anywhere |
| 0 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
above the diagonal line, a 4 inch (102mm) diam- |
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| ALTITUDE IN THOUSANDS OF FEET |
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eter pipe is required. |
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The chart reveals that a 90° elbow is 5 times as | Figure 11.2 |
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restrictive to the flow of exhaust gases under | Example 1: | If the equivalent length of pipe is 23 | ||||||||||
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positive pressure as 1 foot of horizontal pipe, and |
| feet with altitude of 8,000 feet you must use 4 inch | ||||||||||
a foot of horizontal pipe is twice as restrictive as |
| (102mm) diameter type “L” or “PL” vent. |
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a foot of vertical pipe. |
| Example 2: If the equivalent length of pipe is 12 feet | ||||||||||
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WARNING |
| with altitude of 6,000 feet you may use 3 or 4 inch (76 | ||||||||||
| to 102mm) diameter type “L” or “PL” vent |
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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.
September 1, 2008 | Page 11 |
