Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 45
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 Elbow or
Tee Side Wall
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 Tee Verti-
cal Termination
Configuration
Slope horizontal exhaust 1/4 in. per
foot (21 mm per meter) towards the
water heater.
Room Air: Maximum Vent Length
Table 19. Room Air Maximum Equivalent Length
Vent Sizes
2 in. (51 mm) 3 in. (76 mm) 3 in. (76 mm) Ubbink Flex
Vent Length
75 ft (23 m) 150 ft (46 m)
50 ft. (15 m)
45° Elbow
3 ft (1 m) 2.5 ft (0.7 m)
90° Elbow
6 ft (2 m) 5 ft (1.5 m)
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