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Page 16
7036-135G
November 22, 2011
R
Mt. Vernon Pellet Insert (AE)
G. Pipe Selection Chart
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.
Figure 16.1
3 in. or 4 in. (76mm or 102mm) Diameter Pipe
Equivalent Pipe
Length In Feet
ALTITUDE IN THOUSANDS OF FEET
0
20
30
1 2 3 4 5 6 7 8 9 10
4 in. (102mm) Diameter Pipe Only
10
Example 1
Example 2
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.
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.
WARNING! RISK OF FIRE!