I guess it depends on what fans your pc came with... My case came with two small fans. I added a bigger one that fit over where the power supply sticks out. also another small one that blew across the tops of the plants.

The more the better since they arent very strong.
GetThisOrDie Reviewed by GetThisOrDie on . whar lights to use in pc grow box? What lights should I use if I wanna grow 3 lowryders in pc grow box? Thanks Rating: 5