Owner`s manual

R
January 17, 2007
7036-135B
Page 13
Mt. Vernon Pellet Insert (AE)
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
The chart will help you in determining proper venting size accord-
ing to the equivalent feet of pipe calculated above and the altitude
above sea level of this installation. See Figure 13.1. 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 fl ow of exhaust gases under positive pressure as 1 foot of
horizontal pipe, and a foot of horizontal pipe is twice as restrictive
as a foot of vertical pipe.
D. Pipe Selection Chart
Figure 13.1
Fire Risk.
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.
WARNING