The question of data center hot aisle and cold aisle containment is no longer “what is containment,” but now, “How much containment is enough?” There is no one answer to optimum degree of containment, as architectural environments, business objectives, deployment constraints, and cost-benefit curves all weigh on the decision.
white paper 
from Chatsworth Products, Inc. explores the question of hot aisle and cold aisle containment, and how to decide what amount of containment is best for your data center. First, it describes both sides of the argument, ranging from “a little containment is better than none,” to maximizing containment maximizes returns,” offering examples for each. Next, it asks “How much containment is available?” and which containment to use, citing scientific studies on the advantages of one form of containment over another. Lastly, it describes these three forms of containment, Hot Aisle, Cold Aisle, and Cabinet Containment in detail.
Learn both sides of the complex argument of “How much containment?” Click here to download this white paper 
on the many opinions associated with air containment within the data center.
Data center power and cooling topics are of the top reasons data center operators visit Data Center Knowledge. There is a great interest in power and cooling topics (and projects) because they often bring a very quick return on investment. This
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URL to article: http://www.datacenterknowledge.com/archives/2012/05/23/how-much-containment-is-enough/
URLs in this post:
 white paper: http://whitepapers.datacenterknowledge.com/?option=com_categoryreport&task=viewabstract&pathway=no&autodn=1&title=19365&crv=0&src=3956&ctg=655&cmp=5474&yld=1
 Michael Potts: http://www.datacenterknowledge.com/archives/author/mikepotts/
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