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Old 11-16-2006, 03:28 PM
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I've been looking into this myself recently and found that if you have an air flow of 0.8m/s at the top of your rack at the cold isle side, this should make a cold air curtain which in turn prevents the hot air returning into the servers.
Another point which is more important is that if your crac unit distributes say 18,500 m3 per hour of air, you should have enough perforated tiles that equal this amount. Therefore if you are using 350m3 p/h tiles, you require 50 of them in the room. This relieves the overpressure under the floor making your Crac units more efficent and giving you more balanced airflow throughout your racks.
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