Howdy y'all, have a 2 x 4 yield labs tent, with two 450a LED bulbs, covering 2 x 2 respectively . Carbon filter pulling 188 cfm .And a 4" duct fan, with a " y" .And clamp on can .Wondering if I have sufficient airflow, and if I need to switch to my 6" fan , with a " y", or do my 4 and my 6, with...