B-Line SB5773090YZ Eaton series open frame racks, Steel, Yellow zinc, 12-24 panel mounting holes, 58 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack

The mounting rails are punched with 12-24 panel mounting holes, so you fasten equipment with 12-24 machine screws. There is no cage nut or 10-32 prep, so if your gear shipped with 10-32 hardware you will need 12-24 screws and washers instead.

The SB5773090YZ is built as a Seismic Zone 4 network bay closed duct rack, which is what a data room in a high seismic region calls for. It is also UL Listed. Anchoring to the slab and any overhead bracing still has to follow the engineer's detail for your job.

Plan for 90 inches of vertical clearance plus whatever your seismic anchoring detail adds at the base and top. The frame is 90 inches high, 19 inches wide, and 90 inches in length/depth as listed, and it weighs 121 lb, so it is a two-person set and needs to be walked in rather than carried upright through a standard 80 inch door opening.

Top channel means the frame is tied together with a channel across the top, which is the member you use to attach overhead ladder rack or cable runway and, in seismic work, the sway bracing. Runway, waterfall, and vertical cable managers are separate items, not part of the rack.

An open frame two-post like the SB5773090YZ is the choice for patch panels, punch blocks, and switches in a secured telecom or IDF room, where you want full access from both sides and free air movement. Go to an enclosed cabinet instead when the equipment sits in a shared or public space and needs locked doors, or when you need to contain airflow around servers.

Yellow zinc over steel is a plated finish meant for dry interior service, which is exactly where a network bay rack lives. It is not a coating to specify for damp or corrosive locations. If the spec on the drawing calls for a painted black rack for appearance in an exposed space, this one will not match it.