REGULATION INSTRUCTIONS
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• This water requires a special venting system. Refer to the installation instructions for parts list and method of
installation.
• Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel (polyphenylsulfone) in non-metallic
venting systems is prohibitted. Covering non-metallic vent pipe and fittings with thermal insualtion is
prohibitted.
Intake Vent Pipe Materials
PVC, CPVC or ULC S636 pipe and fittings and ABS pipe and fittings can be used for combustion air intake on
FLOWMAX products.
• Transition cement must be used if ABS pipe is connected to the PVC appliance adaptors.
• All plastic components and specified primers and glues of the certified vent system must be from a single
manufacturer and not intermixed with other system manufacturers vent system parts.
• The vent for this appliance shall not terminate over public walkways, near soffit vents, crawl spaces or other
areas where condensate or vapour could create a nuisance or hazard or cause property damage or where
condensate vapour could cause damage or could be detrimental to the operation of regulators, relief valves of
other equipment.
Allowable Vent Lengths
Length Vertical
and Horizontal per
Equivalent Lengths
• Reduce the maximum vent length accordingly for each elbow used.
• Each 2”/3”/4” 45⁰ elbow equates to 2.5 linear feet of vent pipe.
• Each 2”/3”/4” 90⁰ short radius elbow equates to 7.5 linear feet of vent pipe.
• Each 2”/3”/4” 90⁰ long radius elbow equates to 5 linear feet of vent pipe.
• The maximum length listed is for exhaust vent only. The intake length should be equal length.
• The total maximum equivalent vent pipe distance cannot exceed 100ft for horizontal and vertical venting
distance.
• The maximum lengths are not including elbows.
• Exceeding the maximum venting distances will cause the appliance to malfunction or cause an unsafe
condition.
Minimum Vent Lengths
• 3" Diameter - 6" pipe (Iength) plus one elbow.
• 3" Diameter increased to 4” vent pipe + fittings
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