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2
Non-Direct Vent
Non-Direct Vent (Room Air) Example Vent Applications
2 in. or 3 in.
Schedule 40
PVC/CPVC
Snorkel
Termination
Configuration
2 in. or 3 in.
Schedule 40
PVC/CPVC
Elbow or Tee
Side Wall
Termination
Configuration
Ubbink flexible venting
approved for vertical
non-direct vent (room
air) applications only.
Refer to the flex vent
manual for further
details.
Slope horizontal exhaust 1/4 in. per foot towards the water heater.
Non-Direct Vent (Room Air) Maximum Vent Length
Room Air Maximum Equivalent Length Table
Vent Sizes
Vent Lengths
•
45° elbow is equivalent to 3 ft (1 m)
•
90° elbow is equivalent to 6 ft (2 m)
30
(Room Air)
PP Flex Venting
B-Vent Pipe
4 in. (102 mm)
2 in. (51 mm)
3 in. (76 mm)
65 ft (20 m)
150 ft (46 m)
2 in. or 3 in.
Schedule 40
PVC/CPVC
Standard
Upside Down
"U" Vertical
Termination
Configuration
2 in. or 3 in.
Schedule 40
PVC/CPVC
Tee Vertical
Termination
Configuration
2 in. (51 mm) Ubbink Flex
50 ft (15 m)
Rinnai Commercial Hybrid System Installation and Operation Manual
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