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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]] or OU, 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>
At the time the base specification was released, Meta also defined in greater depth the specifications for the [[Rectifier|rectifiers]] and power shelf.<ref>{{cite web |last1=Keyhani |first1=Hamid |last2=Tang |first2=Ted |last3=Shapiro |first3=Dmitriy |last4=Fernandes |first4=John |last5=Kim |first5=Ben |last6=Jin |first6=Tiffany |last7=Mercado |first7=Rommel |title=Open Rack V3 48V PSU Specification Rev: 1.0 |url=https://www.opencompute.org/documents/orv3-48v-psu-spec-rev-1-0-docx-1 |website=opencompute.org |publisher=Meta |access-date=25 September 2024}}</ref><ref>{{cite web |last1=Keyhani |first1=Hamid |last2=Shapiro |first2=Dmitriy |last3=Fernandes |first3=John |last4=Kim |first4=Ben |last5=Jin |first5=Tiffany |last6=Mercado |first6=Rommel |title=Open Rack V3 Power Shelf Rev 1.0 Specification |url=https://www.opencompute.org/documents/ocp-open-rack-v3-power-shelf-rev-1-0-docx-1 |website=opencompute.org |publisher=Meta |access-date=25 September 2024}}</ref> Specifications for the power monitoring interface (PMI), a communications interface enabling upstream communications between the rectifiers and [[Backup battery|battery backup unit]](BBU) were published by Meta that same year, with [[Delta Electronics]] as the main technical contributor to the BBU spec.<ref>{{cite web |last1=Sun |first1=David |last2=Shapiro |first2=Dmitriy |last3=Kim |first3=Ben |last4=Athavale |first4=Jayati |last5=Mercado |first5=Rommel |title=Open Rack V3 48V BBU Specification Rev: 1.4 |url=https://www.opencompute.org/documents/open-rack-v3-bbu-module-spec-1-4-pdf |website=opencompute.org |publisher=Meta |access-date=25 September 2024}}</ref>
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