Sled, tray, and shelf assembly for computer data center

A data center mounting rack for mounting and supporting a plurality of special physical form computer enclosures and port expansion chassises in a stacked arrangement, comprising:

• a shelving arrangement comprising a plurality of spaced apart vertical end supports supporting a plurality of horizontal mounting trays,
• each of the horizontal mounting trays including one or more rows of first openings positioned at a proximal end of each tray for permitting cooling air flow in a vertical direction, said first openings positioned in a pair of spaced apart computer enclosure mounting regions positioned immediately below a computer enclosure mounted above the first openings;
• each of the horizontal mounting trays including one or more rows of second openings positioned at a distal end of each tray for allowing the passage therethrough of cabling for computers mounted to said tray and for permitting cooling air flow in a vertical direction;
• a central supporting rib extending along the length of the horizontal mounting tray, dividing the spaced apart computer enclosure mounting regions;
• a pair of elongate mounting edge ribs extending along each outer edge of each horizontal mounting tray;
• attachment surfaces affixed to each elongate mounting edge rib, for attaching the mounting tray to the vertical end supports;
• one or more slidably-removable horizontal sleds for supporting a computer enclosure in a slidable arrangement relative to the horizontal mounting trays, each horizontal sled capable of assuming a closed position for operation and an open position positioned outwardly of the proximal end of an associated tray to allow access to a computer enclosure and/or port expansion chassis mounted to the sled;
• each horizontal sled comprising a generally planar lower surface, a vertically extending sled face at a proximal end that includes an opening for exposing a portion of a supported computer enclosure, a pair of elongate edge ribs extending along the length of the horizontal sled, with a first elongate edge rib including a port connector tab for supporting electrical connectors of an associated port expansion chassis mounting to a sled;
• and
• each horizontal sled further including a pair of support rails positioned in a central region of the sled, for supporting a mounted computer enclosure and for defining an opening in the sled that is positioned immediately above the first openings of one of the computer enclosure mounting regions of a tray when a sled is in the closed position, for facilitating the flow of air through the first openings and around a computer enclosure mounted to the sled.