B-Line SB5858084TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 45 mounting spaces, Top channel style, Seismic Zone 4, open duct unequal flange rack, Grade 33, ASTM A570

The SB5858084TG gives 45 mounting spaces on an 84 inch tall frame, so you get 45U of usable equipment height in a full-height floor rack. Plan your equipment stack against 45 spaces, not the raw 84 inches, since the top channel and base consume part of the overall height.

Rails are drilled with 12-24 panel mounting holes, so equipment mounts with 12-24 rack screws. Gear supplied with 10-32 or M6 cage nut hardware will not thread into it, so order 12-24 screws (and 12-24 cage hardware where your equipment needs it) with the rack.

Yes. The SB5858084TG is built as a Seismic Zone 4 open duct unequal flange rack, which is what data center, hospital, and public-facility specs in high seismic regions call for. It is also UL Listed. Zone 4 rating applies to the rack itself; the anchorage to the slab and any overhead bracing still have to follow the engineer's detail on the drawing.

Footprint dimensions given are 23 inches wide and 84 inches for length/depth, with an 84 inch height. Lay out aisle clearance from the 23 inch width, and confirm your room can take the stated depth figure before committing the floor plan.

Unequal flange means the two rail flanges are different widths, which opens a duct channel alongside the mounting rails for vertical cable runs. On an open duct rack like the SB5858084TG you route fiber and copper up that channel instead of adding a separate vertical manager, and the top channel construction carries ladder rack or runway across the top of the row.

An open frame rack such as the SB5858084TG is the choice for telecom rooms and data centers where you need all-around access, maximum airflow, and cable duct integration, and where physical security is handled by the room itself. Go with an enclosed cabinet instead if the equipment sits in a shared or public space, needs lockable doors, or needs dust and contaminant protection. Open frame also keeps weight down, at 78.53 lb for this unit.

At 78.53 lb the SB5858084TG is a two-person carry rather than a crane pick, but it is 84 inches tall and awkward to stand alone. Two installers can walk it in and stand it up; load equipment only after it is anchored.

The SB5858084TG is finished in Telco gray powder coat, the standard shade used across B-Line series open frame racks and most telecom room equipment, so it will read the same as existing Telco gray frames and ladder rack. The powder coat over steel also holds up better than paint against cart and cable strikes in a working room.

Construction is ASTM A570 grade 33 steel, a structural hot-rolled sheet steel with a 33 ksi minimum yield, which is the same material class specified on seismic-rated frames. Combined with the Seismic Zone 4 build, it is intended for fully loaded switch and server stacks rather than light-duty patch-only use.