FLOWMAX Technologies FLOWMAX-120 Instruction Manual page 33

Intake Vent Pipe Materials
PVC, CPVC or ULC S636 pipe and fittings and ABS pipe and fittings can be used for combustion air intake
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on FLOWMAX products.
Transition cement must be used if ABS pipe is connected to the PVC appliance adaptors.
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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.
Allowable Vent Lengths
Model Size
FLOWMAX-90 2" / 3" Diam
FLOWMAX- 3" Diam
FLOWMAX- 3" Diam
Equivalent Lengths
Reduce the maximum vent length accordingly for each elbow used.
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Each 2"/3" 45⁰ elbow equates to 2.5 linear feet of vent pipe.
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Each 2"/3" 90⁰ short radius elbow equates to 7.5 linear feet of vent pipe.
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Each 2"/3" 90⁰ long radius elbow equates to 5 linear feet of vent pipe.
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The maximum length listed is for exhaust vent only. The intake length should be equal length.
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The total maximum equivalent vent pipe distance cannot exceed 100ft for horizontal and vertical venting
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distance.
The maximum lengths are not including elbows.
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Exceeding the maximum venting distances will cause the appliance to malfunction or cause an unsafe
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condition.
Minimum Vent Lengths
3" Diameter - 6" pipe (Iength) plus one elbow.
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INSTALLATION INSTRUCTIONS
Max Equivalent
Length Vertical
and Horizontal
per Vent Run Type
100 ft Natural Gas or LP
100 ft Natural Gas
100ft Natural Gas
Exhaust Vent
Schedule 40 PVC/CPVC
Schedule 40 PVC/CPVC
Schedule 40 PVC/CPVC
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Intake Vent
PVC, CPVC or ABS
PVC, CPVC or ABS
PVC, CPVC or ABS