ventalation

well i need a fan

yea right now i have my growbox set up with no ventalation other then 2 computer fans inside the ducting pulling out air from the cooltube,which has the other end open

since im starting flowering today im gonna need another fan and a carbon filter because im going to need to run all the air through the filter and my temps are alittle high and will just get worse with a more crouded box 90 degres lights on 70 off

problem is. this box only comes with 3 holes.
1 6'' hole on the ceiling
1 4'' hole on the back wall( right behind the 6'' one)
1 4'' hole bottom left ( of the left wall)

idealy i would want the light with its own seperate
intake/exaust... but i only have 3.. poorly spaced holes... so i need the best way of ventalating the room with the situation.

the box is only
2 1/2' x 2 1/2' x 4 ft... so thats like 20 cubic feet..

any ideas you have on the setup.. or suggestions for carbon filter/fan would be greatly appriciated im going into flowering today so im gonna need to order something within the week

usefull links

Grow journal ( more pics )

Fan/carbon filter that i think may be appropriate

just get like a 300CFM inline fan. are you trying to fit it inside the tubing or do you have a cutout in your tent for one? If its a 6" opening just buy a 6"inline if not get a centrifugal fan that sits on top and ducks out the air into a carbon scrubber if you want that too... idk if this is what your lookin for but hit me back for anything else

pmed you and updated the post incase anyone else wants to give me there ideas