hey guys i was thinking of getting this inline fan and filter http://www.amazon.com/Hydroponics-Inline-Scrubber-Carbon-Filter/dp/B004Q2ER5C/ref=sr_1_5?s=hi&ie=UTF8&qid=1365149650&sr=1-5&keywords=4+inch+inline+fan
my grow box is gonna be 3ft wide by 2ft long and 4ft high gonna be growing 2 Autos...