Table of Contents
Advertisement
G. 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.
3 ft.
2 ft.
Figure 17.1
NOTE: This is a generic example and is not intended to represent any specific fuel type.
H. 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.
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.
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.
17
Example of 3 Elbow-Rear Vent Termination Calculation
Pellet
Venting
Component
90° Elbow
or Tee
45° Elbow
Horizontal
Pipe
Vertical
Pipe
2 ft.
Table 17.1
WARNING
Vent surfaces get HOT, can cause burns
if touched. Non-combustible shielding or
guards may be required.
# of
Feet of
Elbows
Pipe
3
7
2
30
Example 1
Example 1
20
Equivalent Pipe
Equivalent Pipe
Length In Feet
Length In Feet
Example 2
Example 2
10
0
Figure 17.2
• 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.
Risk of Injury or Property Damage.
• Improper
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.
8105-803B
CAUTION
Multiplied
Equivalent
By
Feet
X
5
X
3
X
1
X
0.5
Total Equivalent Feet
4 in. (102mm) Diameter Pipe Only
4 in. (102mm) Diameter Pipe Only
3 in. or 4 in. (76mm or
3 in. or 4 in. (76mm or
102mm) Diameter Pipe
102mm) Diameter Pipe
1
2
3
4
5
6
7
ALTITUDE IN THOUSANDS OF FEET
ALTITUDE IN THOUSANDS OF FEET
WARNING
installation,
Components
Equivalent
Feet
15
7
1
23
8
9
10
adjustment,
02/22
Advertisement
Table of Contents
