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Rinnai Tankless Water Heater Installation and Operation Manual 39
1. Direct Vent (Twin Pipe)
opening
Air
grade or anticipated
Roof
Figure 32: Twin Pipe Vertical
Termination of Multiple Water Heaters
Intake
60 in.
12 in.
12 in.
12 in.
12 in.
12 in.
IntakeIntake
Figure 33: Horizontal Vent and Combustion
Air Piping
Figure 31
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