I have a Dell 1900 Tower, a Dell 2900 Tower, an Optiplex 330, 2 Linksys 24port Switches, a Cisco PIX and a Meru Controller in a closet that is about 4' across and 6 or 7' deep. Right now my server...
http://www.experts-exchange.com/Hardware/Components/Fans_Cooling/Q_23523913.html