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- Pipe) <br /> Exhaust <br /> Concentric Pipe Overview <br /> Combustion Combustion <br /> air air <br /> Combustion air and exhaust vent directly <br /> through a single concentric connection. <br /> Hot exhaust exits through the interior tube, <br /> while combustion air enters through the <br /> outer layer. <br /> Concentric Pipe Termination Clearances Figure 23: Concentric Pipe <br /> � 60 in.(1.52 m) <br /> Note:24 in.(0.61 m) <br /> to wall or parapet <br /> 12 in. <br /> (0.30 m) <br /> 12 in. <br /> (0.30 m) <br /> 60 in.(1.52 m)vertically <br /> between terminals <br /> Figure 24:Between terminals at <br /> nside different levels <br /> Corner <br /> 12 in.(0.30m) <br /> Figure 22: Concentric Pipe Termination Clearances 2 6 <br /> Figure 25:Between terminals at same <br /> level <br /> All terminations (horizontal and/or vertical) must terminate 12 in. (0.30 m) above grade or anticipated <br /> snow level. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 37 <br />