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Q:I have a 20ft horizontal run for intake and exhaust, can I extend the concentric vent kit with pvc ?
A:Rheem does not recommend PVC pipe to be used as venting for this unit.
Q:What is the type material?
A:The items are manufactured from AL29-4C advanced ferritic stainless steel.
Q:Is this horizontal vent kit a 3inch X 5 inch, does it fit a RMTG-66DV Propane tankless heater
A:Yes the kit is 3"/5" concentric stainless steel. It is not recommended to be use with RMTG66DV heater. It is to be used with these heaters, RTG-64DV, RTG-84DV and RTG-95DV.