B-Line Eaton series open racks, Aluminum, 45, Mounting spaces: 43, Flat black powder coat, Two-post equipment rack

The SB558084XUFB open frame rack provides 43 mounting spaces (rack units) in an 84 inch tall frame. That is the usable EIA hole pattern height, so budget your patch panels, switches and rack-mount UPS against 43U rather than the full 84 inches of frame.

Plan for a 20.31 inch wide by 15 inch deep footprint and a finished ceiling height that clears 84 inches plus whatever you need to stand the frame up and route cable overhead. The 15 inch channel depth is why this style of rack suits patch panels and shallow network gear rather than deep servers.

A two-post open frame like this Eaton B-Line rack supports equipment at a single pair of mounting rails, so it is meant for patch panels, rack-mount switches, and light shallow gear where both sides stay open for cable access. With only 15 inches of depth there is nothing behind the posts to carry deep chassis weight, so servers or long enclosures belong on a four-post rack or a cabinet instead. Open frames also give you no doors or locks, so if the room is not already secured, a cabinet is the better choice.

The frame is aluminum and steel construction and ships at 33 lb, which is light enough for one person to carry into a closet and stand up before it is anchored. Aluminum keeps the weight down compared with an all-steel frame, which matters when the rack is going upstairs or onto a raised floor.

An 84 inch two-post open frame is a floor-mounted rack and must be anchored through the base to the slab or floor structure, and to the wall or overhead ladder rack if your install calls for it. At 33 lb the frame itself does very little to resist tipping once gear is loaded, so anchors are not optional. Rack screws, cage nuts and floor anchors are ordered separately from the frame.

The finish is a flat black powder coat, so it reads matte rather than gloss. If you are extending an existing row of gloss-black or textured-black frames the sheen may not match exactly, though in a back-of-house telecom room that rarely matters. Powder coat holds up well to cart and cable abuse in a busy MDF.