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Common Vent Maximum Equivalent Vent Lengths (Rinnai Common Vent System or Schedule <br /> 40 PVC/CPVC) <br /> Common vent equivalent lengths include polypropylene pipe (PP)or PVC in a back-to-back or inline configuration. <br /> For the table below: —Header Vent Length <br /> • Header is the main vent pipe into which several vents connect. <br /> • Vent Length is the distance from the end of the header to the <br /> vent termination. ri I <br /> • Maximum vent length starts at the end of the header system. <br /> • Use 10 ft. (3 m) as equivalent vent length for 900 elbows. <br /> • For use with SENSE ITM internal (indoor)tankless water heaters <br /> only. Pni*i <br /> Table 20 Fi ure 49 <br /> Max Header Diameter <br /> Water Heater Model #Water System 3 in. 4 in. 6 in. <br /> Heaters gTU/HR <br /> 3 in.Vent Diameter 4 in.Vent Diameter 6 in.Vent Diameter 6 in.Vent Diameter <br /> 2 398,000 65 ft. <br /> 3 597,000 150 ft. <br /> RU199i 4 796,000 65 ft. 150 ft. <br /> (REU-N3237FF-US) 5 995,000 150 ft. <br /> 6 1,194,000 <br /> CU199i 7 1,393,000 70 ft. <br /> (REU-N3237FFC-US) 8 1,592,000 <br /> RU R 199i 9 1,791 000 <br /> (REU-NP3237FF-US) 10 1,990,000 90 ft. <br /> 11 21189,000 <br /> 41 ft. <br /> 12 12388.000 <br /> RU160i 2 320,000 90 ft. 150 ft. <br /> (REU-N2530FF-US) 3 480,000 100 ft. 150 ft. <br /> CU160i 4 640,000 65 ft. <br /> (REU-N2530FFC-US) 150 ft. <br /> RUR160i 5 800,000 <br /> (REU-NP2530FF-US) 6 960,000 <br /> 2 360,000 65 ft. 150 ft. <br /> 3 540,000 <br /> 4 720,000 65 ft. 150 ft. <br /> 5 900,000 150 ft. <br /> 6 1,080,000 <br /> RU 180i 7 1,260,000 <br /> (REU-N2934FF-US) 70 ft. <br /> 8 1,440,000 <br /> 9 1,620,000 <br /> 10 1 800 000 90 ft. <br /> 11 1,980,000 <br /> 12 1 2,160,000 41 ft. <br /> 2 260,000 90 ft. 150 ft. <br /> 3 390,000 100 ft. 150 ft. <br /> RU130i 4 520,000 <br /> (REU-N2024FF-US) 65 ft. 150 ft. <br /> 5 650,000 <br /> 6 780,000 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 49 <br />