B-Line Eaton series open racks, Full-length door compatible with RCM, 150 lb, Steel, Flat black powder coat, 54 mounting spaces, Rack mounted horizon

Published dimensions are 23 in width, 22.3125 in height and 12 in length/depth. The 12 in depth is the run into the rack, so it suits an open frame rack with at least that much clear depth behind the mounting rails. The unit weighs 35.9 lb, which is a two-hand lift when you are working off a ladder in a hot aisle.

UL Listed, per the manufacturer's stated certification. For facilities, hospital and education specs that call for listed rack hardware, that is the credential on record for the SB708235412FB.

54 mounting spaces. In practical terms that is a tall open frame rack, so plan your patch panels, switches and the horizontal transition tray itself against those 54 positions before you order blanks or extra managers.

It is built full-length door compatible with RCM, so if you need to enclose the front later for security in a shared telecom room, the frame is prepped for that rather than being an open-only frame.

Steel with a flat black powder coat. That is the standard flat black used across Eaton B-Line open frame rack gear, so it lines up visually with other black powder coated racks and cable managers in the same row.

A horizontal transition tray gives cable a supported path where it crosses from overhead or adjacent pathway into the rack frame, instead of letting bundles hang on the rails. If you are running cable between ladder rack and an open frame rack, that transition point is where bend radius and strain get violated, and the tray is what stops it. If your cable drops straight down into the rack from a tray directly above, you may only need vertical management.