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pe <br /> Twin Pipe Example Vent Applications <br /> Slope horizontal exhaust 1/4 in. per foot towards the water heater. DO NOT slope combustion air pipe <br /> towards the water heater. <br /> Table 15 <br /> This configuration requires the use of a Concentric Vent This configuration requires the use of a Concentric Vent <br /> Termination Termination <br /> 2 in.or 3 in.PVC/ 2 in.or 3 in.PVC/CPVC <br /> CPVC IPEX/Royal IPEX/Royal Concentric Vertical <br /> Concentric Side Wall Termination Configuration <br /> Termination Configuration <br /> 2 in.or 3 in.Schedule 2 in.or 3 in.Schedule 40 <br /> 40 PVC/CPVC or ABS Snorkel PVC/CPVC or ABS Standard <br /> Termination Configuration upside down"U"Vertical <br /> Termination Configuration <br /> 77 <br /> 2 in.or 3 in.Schedule 2 in.or 3 in.Schedule <br /> 40 PVC/CPVC or ABS Elbow 40 PVC/CPVC or ABS Tee <br /> or Tee Side Wall Vertical Termination <br /> Termination Configuration Configuration <br /> QWARNING <br /> Exhaust and Single <br /> 2 in.or 3 in.PVC ® ® combustion air Pipe <br /> Low Profile Termination MUST NOT be <br /> Configuration ® ® brought together I I <br /> into a single <br /> PVC pipe using J <br /> a pipe fitting. Combustion Exhaust <br /> Air <br /> Twin Pipe Maximum Vent Length <br /> Table 16: Twin Pipe Maximum Equivalent Length <br /> Vent Sizes 2 in. (51 mm) 3 in. (76 mm) <br /> Vent Lengths 65 ft(20 m) 150 ft (46 m) <br /> • 45' elbow is equivalent to 3 ft (1 m) <br /> • 90' elbow is equivalent to 6 ft 2 m <br /> Rinnai Tankless Water Heater Installation and Operation Manual 41 <br />