cooltube set up

hi guys what is the best way top or bottom for
attic grow room.
the room is in the shape of an triangle. 2m x 2m

I would say 2 cause I've seen them done that way but I couldn't tell you why.

Depending on your outside temps.

Have one fan with filter on an try pull cold air from outside throu lights then back out again u then don't need 2nd carbon filter.