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Direct Vent
1
Twin Pipe Example Vent Applications
Slope
horizontal exhaust 1/4 in. per foot (21 mm per meter) towards
slope intake air pipe towards the water
Table 9
This configuration requires the use of a
Concentric Vent Termination
2 in. or 3 in. PVC/ CPVC
IPEX/ Royal
Concentric
Side Wall Termination
Configuration
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.
PVC
Low Profile
Termination
Configuration
Twin Pipe Maximum Vent Length
Table 10. Twin Pipe Maximum Equivalent Length
Vent Sizes
2 in. (51 mm)
Vent Lengths
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
(Twin Pipe)
heater.
IPEX/ Royal Concentric
Vertical
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 or ABS
Tee Vertical Termination
Configuration
Exhaust and
intake air
MUST NOT be
brought
together into a
single PVC
pipe using
a pipe fitting.
3 in. (76 mm)
150 ft (46 m)
2.5 ft (0.7 m)
5 ft (1.5 m)
the water heater. DO NOT
This configuration requires the use of a
Concentric Vent Termination
2 in. or 3 in. PVC/CPVC
Termination
or ABS
WARNING
Intake air
Single
pipe
Exhaust
25
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