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Schedule 40 PVC/CPVC Common Vent Guidelines <br /> A WARNING PVC solvents (primer and glue) can be extremely flammable. Vapors may <br /> cause a flash fire or explosion resulting in property damage, personal injury <br /> or death. <br /> • Keep solvents away from heat, sparks, flames and all other sources of ignition. <br /> • Do not solder, cut or weld until all vapors have dissipated. <br /> • PVC solvents are heavier than air causing them to settle at low points of the system. <br /> • Before Using PVC solvent <br /> — Disconnect power to the water heater. <br /> — Remove the front cover of the water heater. <br /> — Ensure areas around the water heater and PVC venting are all well ventilated. <br /> — Allow all vapors to dissipate before applying power to the system or introducing any other <br /> source of ignition. <br /> When installing PVC/CPVC Common Vent, follow these guidelines: <br /> • Avoid sharp bends or tees in the vent system. Header Ven� <br /> These vent components create additional re- <br /> strictions that could reduce performance of the <br /> water heaters. <br /> • PVC combustion air and exhaust should termi- <br /> nate with elbow or tee pointing down. This will <br /> stop unwanted moisture from entering the vent <br /> system. <br /> • Fire rated penetrations shall be firestopped. <br /> Contact your vent supplier or local firestop man- <br /> ufacturer for appropriate firestop methods. <br /> • Examine all vent components for damage prior Figure 50:PVC/CPVC Common Vent <br /> to installation. Installation <br /> • PVC/CPVC vent systems must be free to DO NOT <br /> expand and contract. Refer to the vent manu- • Do not mix vent pipe, fittings or joining <br /> facturer's installation instructions for appropriate methods from different vent manufactur- <br /> support methods. ers. <br /> • PVC/CPVC venting must include unrestricted • DO NOT attempt to repair damaged <br /> vent movement through walls, ceilings, and roof vent. Damaged vent components must <br /> penetrations. be replaced. <br /> • Use only PVC/CPVC primer and cement ap- • DO NOT use short radius elbows in the <br /> proved for use by the vent manufacturer. common vent system. <br /> • Refer to vent manufacturer's installation instruc- Table 23 <br /> tions for proper joint assembly procedures and Acceptable Acceptable Not <br /> products. Acceptable <br /> • PVC/CPVC common venting should include a 90° Elbows, 90' Elbows, 90' Elbows, <br /> condensate drain and trap between the header Long Sweep Short Sweep Close Turn <br /> and vent length. Condensate trap must include <br /> a loop that can hold 6 in. (15 cm)of water. <br /> Refer to the Rinnai Common Vent Installation <br /> manual for more information. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 51 <br />