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3U would be a height of 5.25 inches and probably too small; reasoning being more height space to minimize air flow turbulence. 4U is 7 inches thick (height) and...

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One 'U' dimensionally, is 1.75 " (inches). You should use a rack mount case on the order of 4 U to 5 U high. This will allow for air flow that is in some 'degree' ...