1st florida grow questions w/ pictures

I'm in the process of setting up a grow tent(more like closet) I plan to use a passive air intake but I'm having trouble deciding what type of.exhaust fan I need for the tent. It is approx. 50 cubic feet. Can I use an inline duct fan.as an exhaust fan? I already made my carbon filter and it has a diameter of 4 1/2 in so I'm looking for a 4 in fan.
 
Also I dont want too strong of a fan, because I've read that exhanging the air too often will stress the plants. How often should all of the air in the tent be exchanged? Every 5 minutes? Everyone seems to have a different opinion
 
Ok thanks :) the only problem is with 50 cubic feet, anything more than 50 cfm means that the air is being exchanged more than once a minute, which seems a little extreme. How.much would an adaptor and carbon filter on the outside affect the cfm rating of a fan?
 
As of 25 minutes ago prop 2 (marijuana law) was officially defeated. So dissapointed.
To the old people and ignorant rednecks: screw you.
 
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