17
06/21
7022-801H
CASTILE INSERT
F. Equivalent Feet of Pipe
The table below can help you calculate the equivalent feet
of pipe which is a method used to determine pellet vent
size
(Figure 17.1)
.
2 ft.
2 ft.
3 ft.
2 ft.
Example of 3 Elbow-Rear Vent Termination Calculation
NOTE:
This is a generic example and is not intended to represent any
specific fuel type.
Figure 17.2
3 in. or 4 in. (76mm or
102mm) Diameter Pipe
3 in. or 4 in. (76mm or
102mm) Diameter Pipe
Equivalent Pipe
Length In Feet
Equivalent Pipe
Length In Feet
ALTITUDE IN THOUSANDS OF 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
4 in. (102mm) Diameter Pipe Only
10
Example 1
Example 1
Example 2
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.
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 17.2)
.
1. Locate the calculated equivalent feet of pipe on the
vertical left side of the chart.
2. Move to the right horizontally on the chart until you
reach your altitude above sea level.
3.
If you fall below the diagonal line, 3 or 4 inch (76 to
102mm) pipe may be used.
4. If it is anywhere above the diagonal line, a 4 inch
(102mm) diameter pipe is required.
Figure 17.1
Pellet
Venting
Component
# of
Elbows
Feet of
Pipe
Multiplied
By
Equivalent
Feet
Components
Equivalent
Feet
90° Elbow
or Tee
3
X
5
15
45° Elbow
X
3
Horizontal
Pipe
7
X
1
7
Vertical
Pipe
2
X
0.5
1
Total Equivalent Feet
23
NOTICE:
A 90° elbow is 5 times as restrictive to the flow
of exhaust gases under positive pressure as
1 foot (305mm) of horizontal pipe. A foot of
horizontal pipe is twice as restrictive as a foot
of vertical pipe.
Vent surfaces get HOT, can cause burns
if touched. Non-combustible shielding or
guards may be required.
WARNING
Risk of Injury or Property Damage.
• Improper installation, adjustment,
alteration, service or maintenance can
cause injury or property damage.
• Refer to the owner’s information manual
provided with this appliance.
• For assistance or additional information
consult
a qualified installer, service
agency or your dealer.
WARNING
Risk of Fire!
•
Only LISTED venting components may
be used.
•
NO OTHER vent components may
be used.
• Substitute or damaged vent components
may impair safe operation.
WARNING
Summary of Contents for CASTILEI-MBK-C
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