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PV500-47C 06/12
9 VENTING
9.1 Venting the TRICON:
TRICON models are designed for operation only with stainless steel venting listed by UL, ULC, ETL or CSA for
Category IV, positive pressure, gas appliance venting. Follow the vent manufacturer’s instructions for installation,
sealing, supporting and terminating their vent system. Do not use plastic venting of any type. Do not use a
barometric damper with the TRICON positive pressure vent.
WARNING: Use only stainless steel venting listed by a nationally recognized testing laboratory for Category
IV, positive pressure, gas appliance venting. Use of plastic pipe of any type or use of venting materials
other than specified in these instructions can result in failure of the venting system and/or exposure to
carbon monoxide which can result in property damage, personal injury or death.
WARNING: Do not vent this water heater into an existing or traditional gas vent or chimney or combine the
vent with any other appliance. Such venting could result in failure of the venting system and/or exposure to
carbon monoxide which can result in property damage, personal injury or death.
9.2 Maximum Category IV Vent Length (Equivalent Length)
A vertical or horizontal remote Category IV vent system must be used with this appliance. The maximum length of
field supplied Category IV vent is shown in the chart below titled Category IV Vent Equivalent Length.
Maximum Category IV Vent Equivalent Length
Vent Size 6” Vent 7” Vent 8” Vent 9” Vent
Max Equivalent Length
100 feet 130 feet 250 feet 450 feet
Pipe fittings reduce the maximum allowable vent length. Use the Category IV vent manufacturer’s equivalent length
deduction for all elbows, terminations, etc. If the information is not readily available from the vent manufacturer, use
the Vent Fitting Equivalent Length chart below to find the total equivalent length for all vent fittings in your
combustion air system. Then subtract this number of feet from the total equivalent length allowed in Maximum
Category IV Vent Equivalent Length chart above. The sum of this calculation is the maximum length of straight vent
allowed. If a longer length is required, repeat the calculation using a larger vent size. When using this chart, no
additional deduction is required for the addition of the vent system terminal.
The following vent information is provided for use in design calculations, if needed.
Venting Specifications
Input Mbtu
Products of Combustion
Volume (cfm)
Max Vent
Press. “W.C.
1500 350 1.7
1800 420 2.0
2000 467 2.0
Vent Fitting Equivalent Length
Vent Pipe: 6” Vent 7” Vent 8” Vent 9” Vent
90º Elbow 8 feet 9 feet 10 feet 11 feet
90º Long Radius Elbow 5 feet 5 feet 5 feet 6 feet
45º Elbow 5 feet 5 feet 5 feet 5 feet