10 '' Pipe Extension for Condensing Tankless Water Heaters Rinnai RCi Series Tankless Water Heaters utilize concentrical venting with an inside pipe that is designed to withstand varying flue temperature conditions that may be experienced over the life of a condensing product. The Ubbink Rolux ® condensing concentrical vent system is part of the aim vent tankless water heater, and has been tested and approved with the appliance by a position party testing agency. elastic out Vent For Intake Easy To Cut To unsullied Steel Dent And Impact insubordinate Corrosion-Proof Non-Flammable Material -LRB- ul94-V0 -RRB- unseamed Extruded Materials Casted Elbows And Adapters White Semi-Gloss Finish -LRB- Eu Ral 9016 -RRB- Aluminum Inner Vent For Exhaust Easy To Cut Compared To unsullied Steel lasting, Thick-Walled Material Dent And Crease insubordinate Not Affected By Scratches circular-knit Extruded Material No Weld lines Thick-Walled, Casted Elbows And Adapters Lightweight Seal Rings With Maximum Temperature 400 °F -LRB- Approx. 200 °C -RRB- Features : GSA Approved Zero Clearance To Combustibles Engineered Especially For Gas Appliance Venting plus Fit And Lock Allows For Installation Assurance Two Layers Of Pipe Equals Two Layers Of Protection Seals At Every Joint Expand And Contract With Weather And Temperature Changes, So There 's No Flexing Or Cracking In The Venting No ignitable, mussy Or denigrative Glues, Cements, Or Solvents Are Used sui generis Penetration Through Wall For Both Intake And Exhaust professional Installation Recommended Specifications : Length : 10 '' For Rinnai certificated Installation : Contact Rinnai at 844-348-4715 .