grow tent passive intake question/help?

[jayww]

got a 5x5 gorilla tent..

got 2 fans, 1 thru the air cooled hood, (in one side out the other) and 1 will be pulling thru a carbon filter on the ceiling of the tent...

so, with the fan that's scrubbing the air, I would like filtered air to be sucked in thru the bottom vents....

the tent has 3 sock/pull string ports on the bottom...

is there a cheaper alternative than buying 3 active air/hepa filters,. or 3 phresh intake filters?... or am I pretty much gonna have to bite the 80 dollar or more for each of the 3 filters??....

thanks for any help.

 

[jayww]

guess im kinda wondering if I can get away with using a short piece of flex tubing, & wrap some stockings over them...

 

[festerous]

A nylon stocking would work well enough but i'm sure there are much better options. I would also put one on the lights intake so you are not sucking up a bunch of dust.