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4.3.6 Clearances <br /> Top Top <br /> Front ' Side Side <br /> Bottom Bottom <br /> Figure 8: Clearances <br /> Table 6 <br /> Location Clearances to Combustibles <br /> • • • • • - <br /> Top 2 in. (51 mm) <br /> 0 in. from vent components <br /> Bottom/Ground 12 in. (305 mm) <br /> Front 0 in. <br /> Clearance for servicing is 24 in. (610 mm) <br /> in front of water heater <br /> Back 0 in. <br /> Sides (Left and Right) 2 in. (51 mm) <br /> Add 0.25 in. (6.35 mm) for recess box <br /> Vent 0 in. <br /> Internal/Indoor Models <br /> Front Exhaust 24 in. (610 mm) <br /> (External/Outdoor Models) <br /> Rinnai Tankless Water Heater Installation and Operation Manual 22 <br />