sry bro but you\\\\\\\'re not going to be able to cool a 250w or a 400w hps w/ cpu fans.

nor should you be using cpu fans to cool an area of that size (unless you roll some low temp solution like led or cfl)....

to roll hps in a closet you need to get a decent cfm inline fan such as a canfan.

there are AMAZING equations on this very board if you search for them for figuring what size fan you\'ll need based on your cubic area.... i\'d start w/ the sticky thread for this very room called \"fans... not just blowing hot air\"...
gedogen Reviewed by gedogen on . Heat output difference 250hps or 400hps? My grow room is 2' deep X4' wide X4'high I will only have limited means of ventilation ie, computer fans for noise reasons, and passive intake. I am only goin to growing 2-3 plants at a time from clones for personal use. I know the 400 watt will provide thicker heavier buds and heavier yeild but is it worth it for the extra heat? Or would the 250 be sufficient for my use, with less heat output? Rating: 5