ducting
We struggle as it is to manage attached flow for vehicles with ALL the air flowing over the body.
If we begin to rob this flow,shunting it internally,we further compromise the 'outer' flow.
If you had time,calculate the volume of air you would wish to move through the duct at a given velocity.Then sit down with an HVAC contractor and have him calculate the horsepower necessary to move that volume,and static pressure,though the smoothest duct-work he could fabricate for the given duct size and length.
This HP requirement would give us something to think about.
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