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nirp-ctVentDe <br /> Twin Pipe Overview <br /> Combustion air and exhaust vent directly through separate penetrations. <br /> Figure 31 <br /> Twin Pipe Termination Clearances <br /> 12 in.(0.30 m) <br /> Intake <br /> minimum� 12 in.(0.30 m) <br /> k <br /> Exhaust 60 in. <br /> min <br /> 12 in.(0.30 m) <br /> minimum aboveCombustion <br /> combustion airAir <br /> opening <br /> m)above <br /> nticipated <br /> _ snow level <br /> Roof <br /> Figure 32: Twin Pipe Vertical Exhaust <br /> Termination of Multiple Water Heaters <br /> 12 in. 12 in. <br /> in min Intake <br /> 12 in. 12 in. 12 in. <br /> min min min <br /> Minimum clearance for <br /> Ground/Grade/Snow Level <br /> Indicates area in which intake cannot be installed. <br /> Figure 33:Horizontal Vent and Combustion <br /> Air Piping <br /> Rinnai Tankless Water Heater Installation and Operation Manual 39 <br />