In general, how many air exchanges would be necessary to cool an enclosed computer cabinet? Is there a ratio? A constant? A rule of thumb? Something like 100CFM of airflow per CF?
closed as not constructive by Nifle, Andrew Lambert, Daniel Andersson, techie007, Oliver Salzburg♦ Jul 15 '12 at 22:10
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My two cents: you should create an airflow installing identical fans both at the front and the rear of the cabinet.
I would look for a fan with the largest diameter you can install w.r.t. the cabinet width. Then, I would try to install as many fans as possible w.r.t. the cabinet and the fan height.
The best fans work using ball-bearings: hence, they are more reliable and quieter. A plus would be an integrated potentiometer to control the CFM - i.e. they offer you the tradeoff between cooling and quiet operation.