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Non-Direct Vent
2
Table 13: 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
Ubbink flexible
venting approved for
vertical
non-direct vent
(room air)
applications only.
Refer to the flex vent
manual for further
details.
Room Air: Maximum Vent Length
Table 14. Room Air Maximum Equivalent Length
Vent Sizes
2 in. (51 mm)
Vent Length
75 ft (23 m)
45° Elbow
3 ft (1 m)
90° Elbow
6 ft (2 m)
Demand Duo
H-Series with SENSEI CX Installation Instructions
(Room Air)
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
Vertical
Termination
Configuration
Slope horizontal exhaust 1/4 in. per foot
PP Flex
(21 mm per meter) towards the water
Venting
heater.
3 in. (76 mm)
150 ft (46 m)
2.5 ft (0.7 m)
5 ft (1.5 m)
3 in. (76 mm) Ubbink Flex
50 ft. (15 m)
32
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