Rinnai Tankless Water Heater Installation and Operation Manual
47
Room Air: Example Vent Applications
2 in. or 3 in. Schedule
40 PVC/CPVC or ABS
Snorkel Termination
Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS
Standard Upside Down
“U” Vertical Termination
Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Elbow
or Tee Side Wall
Termination
Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Tee
Vertical Termination
Configuration
Slope horizontal exhaust 1/4 in. per foot towards
the water heater.
Ubbink flexible venting
approved for vertical
non-direct vent (room
air) applications only.
Refer to the flex vent
manual for further
details.
PP Flex Venting
B-Vent Pipe
4 in. (102 mm)
Table 20: Room Air Maximum Equivalent Length
Vent Sizes
2 in. (51 mm) 3 in. (76 mm) 2 in. (51 mm) Ubbink Flex
Vent Length
65 ft (20 m)
150 ft (46 m) 50 ft. (15 m)
•
45° elbow is equivalent to 3 ft (1 m)
•
90° elbow is equivalent to 6 ft (2 m)
Room Air: Maximum Vent Length
Table 19
