ok so my plan is to build a cab that is a touch tinier than 2.8x2.8 and will be 7 feet high. that should give me about 50watts per square foot. i was planning on putting a 400watt HPS in there. now a couple questions. how many plants would you guys recommend to put in there? its works out to like 7.85sq ft. what do you guys think about this fan for a room taht size: High Tech Garden Supply its a 465 CFM active air blower oh also the brown thing is the blower and the black thing is a carbon scrubber filter and one more thing... should i probably include maybe some passive intakes and exhausts?