Poor sap, he should study before going on TV and making a fool of himself. To suggest that a billionaire bought the NAACP's support (which I believe supported the movement towards legalization before this billionaire guy), is just silly.
NAACP's reason behind supporting the move towards...
Stoney is correct.
From what I know, it's usually best to have a negative air pressure (air pulled into system < air pulled out of system), so have whichever fan pulls less CFM as the intake, whicever pulls more as the outtake.