B-Line SB5572084TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 39 mounting spaces, Top channel style, Seismic Zone 4, closed duct unequal flange rack

It is built as a Seismic Zone 4 closed duct unequal flange rack, so it is the version specified where seismic bracing requirements apply. Anchoring to the floor per the engineer's detail is still what makes the seismic rating meaningful on site.

Unequal flange means the two rail flanges are different widths, so equipment and cable management mount off the deeper side while the narrower side keeps clear. On the SB5572084TG that is paired with a closed duct channel, which routes cable inside the upright rather than hanging it on the outside. If you need symmetric flanges for center-mount gear, an unequal flange rack is the wrong choice.

Yes, the SB5572084TG carries a UL Listed certification, which is what most institutional and government specs call for on equipment racks in a telecom or MDF room.

An open frame rack such as the SB5572084TG gives full access to cabling on all four sides and is what most secured telecom rooms use. Go to an enclosed cabinet instead if you need lockable doors, dust control, or front-to-back forced airflow, since an open frame offers none of those.

At 106.9 lb for the steel frame, it is a two-person set and stand. Plan on lifting it into position empty, plumbing it, then anchoring before any equipment goes on the rails.

The finish is Telco gray powder coat, the standard light gray used across B-Line relay and open frame racks, so it lines up with existing telco-gray rows rather than standing out as black.

Top channel means the uprights are tied together by a channel across the head of the frame. That channel is the structural top brace and the point you tie overhead ladder rack or runway to, which is how a free-standing open frame rack gets braced at the top in a cable-managed room.