In the HVAC industry we use oval duct to fit in restricted spaces. I don't have my ductulator here, but my guess is an ovalized 7" or 8" pipe would do the job to fit in your max 4" headroom, depends on how much you have to flatten it.
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Thien Cyclone Separator Lid Discussion / Re: Inputs and larger top hat build
August 07, 2016, 10:34:53 AMPages1