Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 32
2 in. or 3 in.
Schedule 40
PVC/CPVC
Snorkel
Termination
Configuration
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
Elbow or Tee
Side Wall
Termination
Configuration
2 in. or 3 in.
Schedule 40
PVC/CPVC
Tee Vertical
Termination
Configuration
Non-Direct Vent (Room Air) Example Vent Applications
Non-Direct Vent (Room Air) Maximum Vent Length
Non-Direct Vent (Room Air)
2
Room Air Maximum Equivalent Length Table
Vent Sizes 2 in. (51 mm) 3 in. (76 mm) 2 in. (51 mm) Ubbink Flex
Vent Lengths 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)
Slope horizontal exhaust 1/4 in. per foot towards the water heater.
PP Flex Venting
B-Vent Pipe
4 in. (102 mm)
Ubbink flexible venting
approved for vertical
non-direct vent (room
air) applications only.
Refer to the flex vent
manual for further
details.