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4.5.4 Venting Options <br /> Three types of venting options are available: <br /> (ConcentricDirect Vent,. •' . • Twin Pipe) <br /> Concentric Pipe Twin Pipe <br /> Combustion air and exhaust Combustion air and <br /> vent directly through a single exhaust vent directly <br /> concentric connection. Hot through separate <br /> exhaust exits through the interior penetrations. <br /> tube, while combustion air enters <br /> through the outer layer. <br /> o= <br /> Figure 15: Concentric Pipe Figure 16: Twin Pipe <br /> • - - (Room . • <br /> Room Air External (Outdoor) <br /> Room air is used for combustion External (outdoor)water <br /> while exhaust vents to the heater. <br /> outside. <br /> Figure 17:Room Air Figure 18:External <br /> �3. CornmonVent (Indoor Unit Only. Direct Vent and Non/Direct/Room Air Vent) <br /> Direct Vent Non-Direct (Room Air)Vent <br /> Multiple water heaters sharing a combustion Multiple water heaters using room air for <br /> air header and a separate exhaust header that combustion while sharing an exhaust header <br /> vents directly through separate penetrations to that vents directly to the outside. <br /> the outside. <br /> Ll <br /> a <br /> Figure 19: Common Vent, Direct Vent Figure 20: Common Vent, Room Air <br /> Rinnai Tankless Water Heater Installation and Operation Manual 28 <br />