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pt <br /> Twin Pipe Installation Instructions 3. Install the combustion air vent pipe. Ensure it <br /> is properly seated. <br /> The water heater is equipped with a 2 in. (51 mm) Secure the combustion air vent pipe to the <br /> pipe connection. With the use of a pipe reducer, combustion air vent connection with the <br /> installers can use a 3 in. (76 mm) pipe for the supplied screw. <br /> combustion air and exhaust. <br /> o Combustion Air Vent Pipe <br /> A WARNING DO NOT apply <br /> PVC glues, o — Supplied screw <br /> solvents, or cleaners to the water heater's <br /> combustion air or exhaust gasket -- - <br /> connections. Failure to correctly assemble <br /> the components according to these <br /> instructions may result in property <br /> damage, personal injury, or death. Figure 36 <br /> 1. Remove and discard the screw from the 4. Install the exhaust vent pipe. Ensure it is <br /> combustion air vent connection. properly seated. <br /> Secure the exhaust vent pipe to the exhaust <br /> adapter ring with the supplied screw. <br /> 0 <br /> 0 ° <br /> ° ► <br /> 4 Exhaust Vent Pipe <br /> o Supplied screw <br /> 0 <br /> Figure 34 <br /> m <br /> 2. Remove and discard the combustion air vent <br /> cap. (I\ <br /> Figure 37 <br /> qq , <br /> o U <br /> 0 <br /> Figure 35 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 40 <br />