B-Line Eaton series open racks, Steel, Yellow zinc, 12-24 panel mounting holes, 42 mounting spaces, Top channel style, Seismic Zone 4, network bay cl

42 mounting spaces, which is 42U of usable equipment height on a 90 inch tall frame. That is the standard full-height network bay size, so patch panels, switches, and rack-mount servers built to 19 inch EIA spacing will fill it out normally.

The rails come with 12-24 tapped panel mounting holes, so equipment mounts with 12-24 screws directly. No cage nuts or square-hole hardware needed, and no clip nuts to buy. If your gear shipped with 10-32 screws, order 12-24 screws instead.

Model SB5761090YZ is built as a Seismic Zone 4 network bay closed duct rack, so it is the version specified where seismic anchorage is called out rather than the plain open frame. It is also UL Listed. Floor anchorage to the structure is still part of the install.

The closed duct uprights route cable inside the rack frame itself rather than on external managers hung off the side. That keeps horizontal patch runs contained on a 19 inch wide footprint, which matters in a tight telecom room where you cannot give up aisle width to side channels. The top channel style gives you the overhead run for ladder rack or runway tie-in.

Plan on 19 inches wide by 90 inches deep by 90 inches tall per the published dimensions, plus the aisle you need for rear access. At 90 inches tall it will not pass through a standard 80 inch door opening upright, so route it in on its side or through a taller opening.

An open frame rack such as the SB5761090YZ gives you access from all four sides and free air movement, and it is the cheaper, faster install for a locked telecom room where physical security is handled by the door. Go to an enclosed cabinet instead when the equipment sits in a shared or public space, needs lockable doors, or needs fan-forced or filtered airflow. This one is the open-frame, seismic-rated choice.

117 pounds bare, before any equipment goes in. That is a two-person lift to stand up and hold plumb while the base is anchored, and the anchors have to be sized for the loaded weight, not the 117 pounds.

The frame is steel with a yellow zinc finish, a plated corrosion coating rather than a decorative paint. It is the right pick for back-of-house telecom and equipment rooms where protection matters more than appearance. For a client-facing or finished space where racks are visible, a black painted frame is the usual specification instead.