Page 14
250-7251G
August 20, 2009
R
Castile Pellet Insert
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
qualifi ed installer, service agency or your dealer.
WARNING
The chart will help you in determing proper vent-
ing size according to the equivalent feet of pipe
calcuated above and the altitude above sea level
of this installation.
Figure 14.2.
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 posi-
tive 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
The table below can help you calculate the equivalent feet
of pipe which is a method used to determine pellet vent size.
Figure 14.1.
C. Equivalent Feet of Pipe
2 ft.
2 ft.
3 ft.
2 ft.
Example of 3 Elbow-Rear Vent Termination Calculation
Figure 14.1
Pellet Venting
Component
# of
Elbows
Feet of
Pipe
Multiplied
By
Equivalent
Feet
Components
Equivalent Feet
90
o
Elbow or Tee
3
X
5
15
45
o
Elbow
X
3
Horizontal Pipe
7
X
1
7
Vertical Pipe
2
X
0.5
1
Total Equivalent Feet
23
Note: This is a generic example and is not
intended to represent any specifi c fuel type.
Figure 14.2
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 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
