B-Line Eaton series open racks, Steel, Flat black powder coat, 12-24 panel mounting holes, 77 mounting spaces, Top angle style, Seiemic zone 4, netwo

Yes. The SB506108FB is built as a seismic zone 4 network bay closed duct rack, so it is the version specified for the highest seismic design category on a legacy zone map, which is what hospitals, data centers, and public buildings on the west coast typically call out. It is also UL Listed. Seismic performance depends on the anchorage as much as the frame, so follow the structural drawings for floor anchors and any top bracing to structure.

The rails come with 12-24 panel mounting holes, so they are tapped and you mount equipment directly with 12-24 rack screws. No cage nuts or square-hole hardware are involved. Bring 12-24 screws and cup washers for the gear you are installing, and check that your patch panels and switch brackets are not square-hole only.

Top angle refers to how the frame is finished at the top. The SB506108FB uses the top angle style, which gives you a flat horizontal angle across the top of the bay to land ladder rack, runway, or overhead cable management and to tie the rack to structure for seismic bracing. If you are not bringing overhead pathway to the rack and do not need that attachment surface, a plain top frame is enough.

A closed duct network bay is for high density copper. The closed duct gives you a protected vertical pathway on the bay for patch cords and trunk cables so the bundles stay off the equipment and off the mounting rails, which matters when you are filling 77 spaces with patch panels and switches. A plain open relay rack is the simpler pick when you are mounting a handful of devices with light cabling and do not need managed vertical routing.

Order Eaton B-Line part number SB506108FB. That number covers the 108 inch high, 19 inch wide seismic zone 4 closed duct network bay in flat black powder coat with 12-24 tapped rails and 77 mounting spaces. It is a single configuration, so there is no finish or height option to specify separately.

The frame is steel to ASTM A1011SS, a hot-rolled structural sheet and strip spec, finished in a flat black powder coat. Flat black is the standard look for telecom and network closets and matches most rack-mount equipment and adjacent cable runway. Powder coat over steel is fine for conditioned indoor rooms; it is not a spec for wet or corrosive exterior locations.