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Aug 9, 2017 at 22:07 comment added d.george The vent piping from the ceiling to the end above the roof should be double wall Type A or Type B depending on the type of water heater you have and the fuel being burned. In some cases you may even need special venting products as specified by the heaters manufacturer. To certain of a proper installation you should a professional water heater company.
Aug 9, 2017 at 17:33 history answered JPhi1618 CC BY-SA 3.0