INSTALLATION INSTRUCTIONS
29
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.
Allowable Vent Lengths
Model
Size
Max Equivalent
Length Vertical
and Horizontal
per Vent Run
Type
Exhaust Vent
Intake Vent
FLOWMAX-90
2" / 3" Diam
100 ft
Natural Gas or LP
Schedule 40 PVC/CPVC
PVC, CPVC or ABS
FLOWMAX-
3" Diam
100 ft
Natural Gas
Schedule 40 PVC/CPVC
PVC, CPVC or ABS
FLOWMAX-
3" Diam
100ft
Natural Gas
Schedule 40 PVC/CPVC
PVC, CPVC or ABS
Equivalent Lengths
•
Reduce the maximum vent length accordingly for each elbow used.
•
Each 2”/3” 45
⁰
elbow equates to 2.5 linear feet of vent pipe.
•
Each 2”/3” 90
⁰
short radius elbow equates to 7.5 linear feet of vent pipe.
•
Each 2”/3” 90
⁰
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.
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