yea no you dont want that go to ebay or amazon and search 6inch inline fan then find cheap one yea i would cut holes on both side and run your duct through. gl
man i was in similar situation and bought sum duct ran it from my ac vent in my room to my grow closet.. worked perfectly cooled it down just enough to work out great! thats what id reccommend cause i have a 400 and heat is something im to familiar with lol wish id went with cooltube or...