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7077-801D • September 17, 2019
(877) 477- 4768
28
C. 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.
2 ft.
2 ft.
3 ft.
2 ft.
Example of 3 Elbow-Rear Vent Termination Calculation
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
NOTE: This is a generic example and is not intended to represent any specic
fuel type.
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 FEETALTITUDE IN THOUSANDS OF FEET
0
20
30
1 2 3 4 5 6 7 8 9 10
4 in. (102mm) Diameter Pipe Only4 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.
D. 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.
a. Locate the calculated equivalent feet of pipe on the
vertical 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.
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 qualied installer, service agency
or your dealer.
WARNING
Vent surfaces get HOT, can cause burns
if touched. Non-combustible shielding or
guards may be required.
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
NOTICE:
• A 90° elbow is 5 times as restrictive to the ow 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.
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