well its not so much a box as it is a mini grow tent.it has holes in it for venting.

as for the fans. this box is 16 cubic feet. these fans should move it twice a min... atleast... so if a cooltubes in there i cant see heat being too much of an issue especially with the smaller hps as for the carbon filter. i would get one later into the grow after i already set the other things up. plants dont start to smell untill they flower

as for the lighting.. i still havent found a good spot to get what i want... the 250 light i would want will cost around the same as a 400 watt cooltube/digital .. i would be getting all the parts seperate ballast/hood/cords/bulb because i cannot find them in a single package the ballast's ive seen are lumtek or gallaxy and run around 150$