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My understanding is that PVC should not be used. Since the OAK is a part of the loop of combustion air.....fire....exhaust, should a power outage occur, the cycle could become reversed, thus making the OAK, the exhaust.....Probably not the best thing for PVC. I think most any metal pipe is acceptable. Flex 3" is available from the big box stores such as Lowes and Home Depot. Seems the easiest to work with. Some folks have used flexiible automotive exhaust too.