B-Line Eaton series open racks, Steel, Telco gray powder coat, 51 mounting spaces, Top channel style, Seismic Zone 4, network bay open duct rack, AST

It is built as a Seismic Zone 4 network bay rack, which is the highest of the legacy seismic zone classifications and the one that covers most of coastal California. That rating depends on the rack being anchored per the manufacturer's floor and overhead bracing requirements, so the structural anchorage on the drawing still has to be followed.

An open duct rack is a two-post style frame with no doors or side panels, so cabling drops straight in from overhead runway and air moves freely around the equipment. Choose it for telco and network bays where you want fast access and high cable density. Go to an enclosed cabinet instead when you need physical security, dust control, or containment of hot and cold aisles, since an open frame offers none of those.

137 pounds for the frame alone. That is a two-person lift at minimum, and standing a 140 inch frame upright safely usually takes two or three people plus a lift assist. Plan floor anchoring hardware and overhead bracing to be at hand before you raise it.

Yes, the rack is UL Listed, which is usually what satisfies a spec section or an AHJ asking for third-party listing on equipment racks in a telecom or data room.

Top channel construction means the two uprights are tied together by a channel across the top, which stiffens the bay and gives you a point to attach overhead cable runway and seismic bracing. It is the standard arrangement on Zone 4 network bays, where the frame has to be restrained top and bottom rather than just bolted at the floor.

Order Eaton B-Line model SB5772140TG. That number covers the 19 inch wide, 140 inch tall telco gray Zone 4 open duct network bay with 51 mounting spaces. Floor anchors, overhead runway, and any vertical cable management or power strips are separate items.

The frame is finished in telco gray powder coat, the standard central office gray used across B-Line network bays, so it lines up visually with existing telco-gray equipment racks and cable runway. Powder coat over steel also holds up better to handling and cable pulls than a wet paint finish.

The frame is steel meeting ASTM A1011SS, a hot-rolled structural-quality sheet steel spec. That is the material call-out to quote back if a submittal or spec section asks for the rack's structural steel grade.