B-Line Eaton series open racks, Steel, Telco gray powder coat, 58 mounting spaces, Top channel style, Seismic Zone 4, network bay open duct rack

The SB5851108TG gives 58 mounting spaces (58 rack units) on a frame that stands 108 inches tall. That is a taller-than-standard bay, so check your ceiling height and any overhead cable tray or sprinkler clearance before you commit to it. Rail width is 19 inches, the standard EIA equipment width.

The mounting rails are punched with 12-24 panel mounting holes, which is the standard thread for network patch panels, switches and shelves in a telco open frame. If your gear came with 10-32 or M6 screws you will need 12-24 hardware instead, and cage-nut equipment is not what this frame is set up for.

Yes. The SB5851108TG is built as a Seismic Zone 4 network bay open duct rack, so it is the version to specify where a project drawing calls out seismic anchorage. It is also UL Listed. Anchoring to the slab, and to overhead bracing where the drawing calls for it, is what makes the seismic rating hold in the field.

An open frame bay like this one leaves all four sides accessible, so patching, cable dressing and airflow are easier and cheaper than in a cabinet. What you give up is physical security and dust control. Use the open frame in a locked, dedicated MDF or IDF room; use an enclosed cabinet when the equipment sits in a shared space, a classroom, or anywhere the public can reach it. This frame is the open duct type, meant to be run with vertical cable management alongside.

The top channel is the horizontal member across the head of the frame. It stiffens the bay and gives you the mounting point for overhead ladder rack, cable runway or waterfall kits coming off the top of a 108 inch tall frame. If your room is being tied together with overhead runway, top channel is the style you want.

The frame weighs 87.45 lb bare steel. That is a two-person lift to stand and plumb a 108 inch bay, and you want the anchors laid out before you tip it up, not after.

It ships in Telco gray powder coat over steel, the standard gray used across B-Line open frame bays, so it lines up visually with existing telco racking in most equipment rooms. Powder coat over steel also holds up better to cart and ladder contact than a painted finish.