B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 66 mounting spaces, Top angle style, Seismic Zone 4, open

The SB556108TG gives you 66 mounting spaces on a 108 inch tall frame, which is the full-height two-post configuration for a telecom or data room. Each mounting space is one rack unit of usable panel height, so you can load 66U of switches, patch panels, and rack-mount gear on the 12-24 threaded panel mounting holes.

Yes. The rack is 19 inches wide, the standard EIA rack width, so any 19 inch rack-mount panel, switch, or patch panel mounts straight to it. The rails are tapped 12-24, so bring 12-24 rack screws rather than 10-32 or M6 cage nuts.

It is built as a Seismic Zone 4 open duct unequal flange rack, which is what specifiers call out for high seismic regions such as California. It is also UL Listed. Keep in mind the rack itself is only part of the assembly: a seismic install still needs the floor anchorage and overhead bracing detailed by the engineer of record.

Unequal flange means the two legs of the upright channel are different widths, so one face is deeper than the other. That extra material stiffens the upright and gives a wider surface for cable management and vertical duct to attach along the side, which is why it is common on telco open racks carrying heavy overhead cable loads. If you are only hanging a few patch panels in a light-duty IT closet, a plain equal-flange rack is enough; the unequal flange earns its place on full-height 108 inch runs like this one where cable weight and seismic bracing are in play.

Top angle is the style of this rack, so the frame is configured with the top angle arrangement used to tie into overhead cable runway and ladder rack. The runway, waterfall, and junction hardware itself are separate items you order to match your ceiling layout.

It is an open frame rack, not a cabinet. There are no side panels, no doors, and no locking enclosure, so equipment is accessible from all sides and cable drops straight in. If you need physical security or airflow containment for the gear, you want a locking enclosure instead of this open frame.

Telco gray powder coat over steel, which is the standard color for central office and telecom equipment racks. If the existing frames in the room are telco gray, this will line up with them visually.

The frame weighs 39 lb, so it is a two-person lift mainly because of the 108 inch length, not the weight. Plan on setting it, plumbing it, then anchoring to the floor before loading equipment, since an unloaded two-post open frame is top heavy once panels go in.