2.5x2.5x4 ventilation help?

Have a 2.5x2.5x4 small tent have 400 what hps with dimmable digital ballast, runs 3variables full , 75% , or 50% power. Have 6 inch inline fan and charcoal booster where can I put this dammed fan.the 6 inch Reflector is a inline air cooled by euro. But any suggestion where the fan belongs?
 

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