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Room Air: Example Vent Applications <br /> Table 18 <br /> 2 in. or 3 in. Schedule 2 in. or 3 in. Schedule 40 <br /> 40 PVC/CPVC or ABS PVC/CPVC or ABS <br /> Snorkel Termination Standard Upside Down <br /> Configuration "U" Vertical Termination <br /> Configuration <br /> 2 in. or 3 in. Schedule 40 2 in. or 3 in. Schedule 40 <br /> PVC/CPVC or ABS Elbow PVC/CPVC or ABS Tee Verticz <br /> or Tee Side Wall Termination Configuration <br /> Termination <br /> Configuration <br /> Ubbink flexible venting Slope horizontal exhaust 1/4 in. per foot towards <br /> approved for vertical PP Flex Venting the water heater. <br /> non-direct vent(room <br /> air) applications only. <br /> Refer to the flex vent <br /> manual for further <br /> details. <br /> B-Vent Pipe <br /> 4 in. (102 mm) <br /> Room Air: Maximum Vent Length <br /> Table 19: Room Air Maximum Equivalent Length <br /> Vent Sizes 2 in. (51 mm) 3 in. (76 mm) 2 in. (51 mm) Ubbink Flex <br /> Vent Length 65 ft(20 m) 150 ft(46 m) 50 ft. (15 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 47 <br />