the pc fans work, but why not get a 6 or 8in inline fan from home depot that flows a WHOLE lot more, their only 30-40bucks and well worth it. Mine is currently cooling a 600w hps and its actually keeping temps down enough that the plants don't mind the heat
4x4Turbo Reviewed by 4x4Turbo on . What Size Fan For Growbox? And where to buy? I have two 18 gallon rubbermaid containers stacked on top of each other. There are 6 to 8 cfls in there at a time. I have fashioned a carbon filter and a passive intake that will open up when air is being pulled through the box. What about a fan to pull this air? I went to Lowes and they couldn't help me out. I need something almost silent but something that will keep the box cool. I was looking at computer fans but how many cfm fan would I need? Rating: 5