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sorry for the newb questions but how would i make a home made carbon filter? and im not sure if i can make a vent outside considering its a computer and hoses going out side from the back of a computer would be obvious, and would i have to keep the fans on all the time?

Ok dont laugh, im a newbie but im going to build a grow box, and insulate it with Mylar Reflective film and put 1 120mm fan and 80mm double ball bearing fan (1 exhaust 1 intake) and Four lights are 2400k (fall) and the other four are 6500k (summer) In order to produce optimal growth rates the...