Harman® • Absolute43 Installation Manual_R2 • 2015 - ___ • 03/15
17
3-90-00778i
C. Venting & Use of Elbows
continued
Note:
When the amount of vertical pellet vent pipe in the system exceeds 15 feet, 4” pellet vent pipe should be used.
Note:
Equivalent Venting Length decreases as altitude increases.
Note:
When the High Altitude Fan Blade is used, the maximum length of Outside Air Pipe decreases to 20 ft.
Example:
A unit with an EVL of 13, is to be installed at an altitude
of 3,000 feet above sea level.
From the chart to the left, at 3,000 feet of altitude, the
maximum permissible equivalent venting length is 26
feet. Therefore this would be an acceptable installation
with no need to change the combustion blower fan.
However, if the same unit (EVL 13)was to be installed
an altitude of 9,000 feet above sea level, the installation
would no longer be acceptable and the equivalent vent
length of the pipe would have to be reduced for proper
unit operation.
No Change of Combustion
Blower Fan Blade Needed
0 Ft
5 Ft
5 Ft
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
5 Ft
0 Ft
10 Ft
Combustion Blower Fan
Blade Changeover Line
Altitude
10 Ft
15 Ft
20 Ft
25 Ft
30 Ft
5 Ft
0 Ft
15 Ft
Equivalent V
ent Length (EVL)
Maximum Horizontal Run
• Long runs of flex or PL vent pipe installed directly vertical from the flue stub may require more frequent cleaning due to
fly ash falling off inside and collecting directly above the combustion blower outlet.
• 4" stainless steel flex vent piping is only allowed for use in masonry fireplaces and chimneys or factory built wood-
burning fireplaces with Class A metal chimneys.
• All pellet vent pipe must be secured together either by means provided by pipe manufacturer or by 3 screws at each joint.
• Use only the specified venting components. Use of any other components will void the product warranty and may pose
a hazard.
• Do Not Install a Flue Damper In The Exhaust Venting System of This Appliance.
• DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER APPLIANCE.
• Simpson DuraVent PelletVent Pro Harman®Adapter Part #3PVP-ADHB and PelletVent Pro Harman®Adapter Increaser
Part #3PVPX4ADHB are highly recommended to be installed on the starter collar to insure a proper pipe connection to
the unit.
•
INSTALL VENT AT CLEARANCES SPECIFIED BY THE VENT MANUFACTURER
• Use silicone to create an effective vapor barrier at the location where the chimney or outside air ducting passes through
to the exterior of the structure
