Bro, I've been making do without even a fan for the veg closet for the past few weeks. I had a tower fan but the dogs knocked it over while I wasn't home and it broke. I just haven't gotten around to replacing it. With the door wide open the temps don't get above 86 even without the fan. Not ideal but the plants grow just fine in there. The reason I haven't got the fan for the veg closet is because I have been busy with the flower room ventilation. I finally have it to where I can seal up the room and the heat doesn't spiral out of control. I had to cut a six inch square out of the bottom corner of the door and rig up a muffin fan with a piece of large poster paper rolled into a cone fitted onto it to syphon the air into the opening. There's a little more to it than that but I'll wait till I can get some pics to help me describe. But as far as the veg closet full of CFLs, very little is needed in the way of ventilation.