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Room Air: Installation Instructions <br /> 1. Remove and discard screw from combustion ° <br /> air vent connection (Figure 42). <br /> 0 <br /> 0 Co <br /> Figure 42 <br /> 2. Remove and discard the combustion air vent cap <br /> (Figure 43). ° <br /> o U <br /> ° <br /> Figure 43 <br /> Combustion Air Vent Pipe <br /> 3. Install the combustion air vent pipe. Ensure <br /> it is properly seated. 0 <br /> Secure the combustion air vent pipe to the Supplied 0 <br /> combustion air vent connection with the screw <br /> supplied screw(Figure 44). <br /> Figure 44 <br /> Elbow <br /> 4. Place the vent screen or room air screen _ <br /> inside elbow and secure with the supplied C . o Supplied screw <br /> screw. Use the room air screen for <br /> environments where room air is dusty VenAScreen <br /> (Figure 45). u <br /> Note: <br /> • 2 in vent screen supplied with water <br /> heater. <br /> • Room air screen is available as an <br /> accessory. Figure 45 <br /> Exhaust Vent Pipe <br /> 5. Install the exhaust vent pipe. Ensure it is 0 Supplied screw <br /> properly seated. o <br /> Secure the exhaust vent pipe to the exhaust <br /> adapter ring with the supplied screw(Figure 46). <br /> Figure 46 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 46 <br />