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      11-10-2012, 11:44 AM   #7
will.c
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Drives: E46M
Join Date: Mar 2011
Location: Central Jersey

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just short input: (small) reduction of pipe cross section area most likely will not affect the volume flow rate of air going in; it compensates by increasing the flow velocity at the smaller end. Since the pipes will always have bends, drag due to vends restrict more than the drag from reduction of diameter, hence I'd say tapering down to even 2" is no prob.