B-Line Eaton series open racks, Steel, Yellow zinc, 12-24 panel mounting holes, 65 mounting spaces, Top channel style, Seismic Zone 4, network bay op

The B-Line SB5776090YZ is built as a Seismic Zone 4 network bay open duct rack, so it is intended for the highest seismic zone classification. It is also UL Listed. For a data room or telecom closet in an active seismic region, that is the designation specifiers look for on the drawing.

65 mounting spaces on a frame 90 inches tall. That is usable panel space for switches, patch panels and rack-mount gear, so plan your elevation drawing around 65 spaces rather than the raw height.

The rails are tapped with 12-24 panel mounting holes, so equipment fastens directly with 12-24 rack screws. No cage nuts or square-hole hardware needed. If your gear ships with M6 or 10-32 screws, order 12-24 screws to match the rails.

Plan on 23 inches wide and 90 inches deep by 90 inches high as the stated dimensions. Add your own service clearance front and rear, since an open duct rack is worked on from both sides. The frame weighs 121 lb, which matters for floor loading and for how many hands you need on the install.

The top channel style gives you a channel across the top of the frame to mount ladder rack or runway to, so overhead cable pathway ties into the rack instead of being supported separately. Vertical cable managers and the runway itself are separate items, not part of the rack.

An open duct rack is the right call when you own the room and want maximum access and airflow for patch panels, switches and cross-connect work. Pick an enclosed cabinet instead when you need physical security, dust control, or containment, since an open frame provides none of those. The SB5776090YZ is open on all sides by design.

Order Eaton B-Line part number SB5776090YZ. That is the 90 inch, 23 inch wide, yellow zinc steel frame with 12-24 tapped rails and 65 mounting spaces. The YZ suffix identifies the yellow zinc finish.

Yellow zinc on steel is a plated corrosion finish rather than a cosmetic one. It is common where the rack is functional and out of sight, or where grounding continuity through the frame matters. If the rack sits in a visible lobby or client-facing space, a painted black frame is the usual choice on looks alone; electrically and structurally the yellow zinc steel frame does the same job.