B-Line Eaton series open racks, Steel, Yellow zinc finish, 12-24 panel mounting holes, 51 mounting spaces, Top channel style, Seismic Zone 4, network

The rack gives you 51 mounting spaces on the rails, so you can populate 51 rack units of switches, patch panels and cable management top to bottom. That is well beyond the 45U you get from a common 84 inch two-post rack, which is the point of the 138 inch frame height.

Panel mounting holes are 12-24 tapped, so you mount equipment with 12-24 rack screws. Cage nuts are not used and not needed. Order 12-24 screws and washers to suit your patch panels and switch ears, since mounting hardware is a separate line item from the rack frame.

It is built as a Seismic Zone 4 network bay open duct rack, which is the highest of the legacy seismic zone classifications and the one that covers most of coastal California. The frame is also UL Listed. Anchoring to the slab and overhead bracing per your structural engineer's detail is still what makes the installation compliant.

Yes. The frame is 19 inches wide, the standard EIA rack width, so any 19 inch patch panel, switch or server shelf with 12-24 mounting will land on the rails.

Plan on it. The rack weighs 136 lb bare and stands 138 inches, so raising it upright is a two or three person job with a lift or ladders, and you want the base anchors laid out and the top channel bracing ready before you stand it. Handling it alone in a finished telecom room is how frames get damaged.

The top channel is the ladder-rack and bracing interface at the head of the frame. It gives you a continuous member to land cable runway on and to tie the rack back to overhead structure, which is how the bay gets its seismic stability. On a 138 inch open duct bay that overhead tie is not optional in a Zone 4 installation.

Yellow zinc plating over the ASTM A1011SS steel is a conditioned indoor finish. It is right for telecom rooms, MDF and IDF closets and data centers. For a loading dock, a parking structure or anywhere with condensation or washdown, specify a hot dip galvanized or powder coated frame instead.

An open duct rack like this one is for controlled, access-restricted telecom rooms where you want unrestricted airflow, fast patching access from all four sides, and easy cable dressing to overhead runway. Pick an enclosed cabinet instead when you need lockable physical security, dust control, or a shared space where non-IT staff can reach the gear. This frame gives you no doors or side panels, just 51 mounting spaces of open rail.