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===Rack and Power designs ===
The designs for a mechanical mounting system have been published, so that open racks have the same outside width (600 mm) and depth as standard [[19-inch rack]]s, but are designed to mount wider chassis with a 537 mm width (21 inches). This allows more equipment to fit in the same volume and improves air flow. Compute chassis sizes are defined in multiples of an [[Open Rack#OpenU|OpenU]], which is 48 mm, slightly taller than the typical 44mm [[rack unit]]. The most current base mechanical specifications were defined and published by Meta as the Open Rack V3 Base Specification in 2022, with significant contributions from [[Google]] and [[Rittal]]<ref>{{cite web |last1=Charest |first1=Glenn |last2=Mills |first2=Steve |last3=Vorreiter |first3=Loren |title=Open Rack V3 Base Specification |url=https://www.opencompute.org/documents/open-rack-base-specification-version-3-pdf |website=opencompute.org |publisher=Meta |access-date=25 September 2024}}</ref>.
===Energy efficient data centers ===
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