Hi paradiseland,
I just recently used a 1.5 inch thick aluminum pipe to extend the exhaust and a 2inch pvc pipe to extend the intake. I wrapped the area where the parts meet with aluminum duct tape (the good stuff) to seal any exhaust leaking out. I found a website that sold me the aluminum pipe but I was at my local home center the other day and saw that 1.5 inch think metal electrical conduit pipe would have probably worked.
I have been using this for a month now with no problem.
Good luck
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