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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: aryeh.friedman@gmail.com, freebsd-questions@freebsd.org
Subject: Re: OT: how many rankmount units is a tower-case
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>
>> 1U=4.5cm
>
> Approximately :)

at least in poland it's said that. i must check in my 12U rack ;)

>
> At least in the US, 1U = 1.75 inches = 4.445 cm, so an 18cm case
> will not quite fit into 4U.  Perhaps metric racks are different.
well it will with slight amount of pressure ;) to compensate this 2.8mm