B-Line SB5874140TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 37 mounting spaces, Top channel style, Seismic Zone 4, network bay closed duct rack, 11 gauge

The SB5874140TG is built as a Seismic Zone 4 network bay closed duct rack, so it is the version to specify where a seismic zone 4 requirement is on the drawing. It is also UL Listed. Seismic performance still depends on the anchorage and any overhead bracing being installed per the engineer's detail, so the floor anchors and top bracing have to be ordered and installed to suit the structure.

Closed duct means the bay is configured with enclosed vertical cable duct as part of the network bay assembly, so jumpers and station cable are routed inside a covered channel rather than open-air cable rings. It is a top channel style frame, which is what ties multiple bays together in a lineup and carries overhead cable runway support. If you are building a row, the top channel is what you use to gang bays and land the ladder rack.

37 mounting spaces on the SB5874140TG means 37 panel positions on the 12-24 punched rails. Telecom mounting spaces are counted per panel position rather than as EIA rack units, so confirm your panel heights in mounting spaces when you lay out the bay, particularly if you are mixing EIA rack-unit gear into a telco bay.

Order it as Eaton B-Line SB5874140TG. That is the manufacturer part number for the 19 inch, 140 inch tall, 37 mounting space Seismic Zone 4 closed duct network bay in Telco gray with 12-24 rails.

Finish is Telco gray powder coat, the standard color used across telecom central office and MDF equipment, so it lines up visually with existing Telco gray bays and ironwork. There is one model on offer here, SB5874140TG, so the finish is not a selectable option.