R
Mt. Vernon Pellet Stove (AE)
D. Pipe Selection Chart
The chart will help you in determining proper venting size according to the equivalent feet of pipe calculated in Vent Termination Calculation Table and the altitude above sea level of this installation. See Figure 12.1.
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 flow of exhaust gases under positive pressure as one foot of horizontal pipe, and a foot of horizontal pipe is twice as restrictive as a foot of vertical pipe.
WARNING
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.
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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 |
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10 |
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3 in. or 4 in. (76mm or 102mm) Diameter Pipe |
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0 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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ALTITUDE IN THOUSANDS OF FEET
Figure 12.1
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 12 | September 1, 2008 |