Mt. Vernon Pellet Insert (AE)
G. Pipe Selection Chart
The chart will help you in determining proper venting size according to the equivalent feet of pipe calculated previously and the altitude above sea level of this installation.
Figure 16.1.
a.Locate the calculated equivalent feet of pipe on the verti- cal left side of the chart.
b.Move to the right horizontally on the chart until you reach your altitude above sea level.
c.If you fall below the diagonal line, 3 or 4 inch (76 to 102mm) pipe may be used.
d.If it is anywhere above the diagonal line, a 4 inch (102mm) diameter pipe is required.
NOTICE:
•A 90° elbow is 5 times as restrictive to the fl ow of exhaust gases under positive pressure as 1 foot (305mm) of hori- zontal pipe.
•A foot of horizontal pipe is twice as restrictive as a foot of vertical pipe.
R
WARNING! RISK OF FIRE!
Do NOT pack insulation or other combustibles between fi restops.
•ALWAYS maintain specifi ed clearances around venting and fi restop systems.
•Install fi restops as specifi ed.
Failure to keep insulation or other material away from vent pipe may cause fi re.
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| 4 in. (102mm) Diameter Pipe Only |
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Example 1 |
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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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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
ALTITUDE IN THOUSANDS OF FEET
Figure 16.1
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 altitude of 6,000 feet (1829m) you may use 3 or 4 inch (76 to 102mm) diameter type “L” or “PL” vent.
Page 16 | November 22, 2011 |