I can 3D print those.Plan is to split the blower flow in 3 ways,each for one board.Think that the flow spread thru the boards will be better then from classical fan.
Please correct me if im wrong.

P.S i have one old S5 laying around.Can a hash board from s7 be connected to S5?Also is there a way to enable 4 board on S9 controller?
 

cr