B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 39 mounting spaces, Top channel style, Seismic Zone 4, clo

The SB5569108TG is built as a Seismic Zone 4, closed duct unequal flange rack, so it is the version specified where seismic anchorage is required rather than a standard open rack. It is fabricated from 11 gauge steel to ASTM A1011SS and is UL Listed. Anchorage to the slab and any overhead bracing still has to follow the engineer's detail for the opening.

39 mounting spaces on a frame 108 inches high. That is the tall telco-height frame, so check ceiling clearance and any overhead cable runway or ladder rack elevation before you commit, since you lose usable top spaces if the runway sits low.

The rails carry 12-24 panel mounting holes, which is the standard telecom tapped pattern. Standard 19 inch EIA panels and patch panels with 12-24 hardware bolt directly to the rails. Gear supplied with 10-32 or M6 screws will need the correct 12-24 rack screws instead, and cage nuts are not used on a tapped rail.

Plan for a footprint based on 23 inches wide by 108 inches deep as listed for the frame, plus front and rear working clearance for your jurisdiction. The frame weighs 107 lb bare, so budget for two people to stand it and for the floor loading once populated.

Unequal flange describes the rail profile: the two flanges of the upright differ in width, which changes how much material sits behind the mounting face. It is the profile specified on closed duct seismic frames like the SB5569108TG, and it affects how side brackets, cable managers, and duct attach, so confirm accessories are listed for an unequal flange upright rather than an equal flange one.

Top channel means the frame is closed across the top with a channel, which gives you a flat surface to land overhead cable runway and tie the rack into the ladder rack system. Pick it when the rack is bonded into an overhead runway grid, which is the usual telco and data room build. An open or angle top is only worth considering where nothing lands on top of the frame.

What ships is the steel open frame itself: uprights with 12-24 tapped rails, top channel, and Telco gray finish. Floor anchors sized for your slab, vertical and horizontal cable managers, power strips, grounding kit, and any panels or shelves are ordered separately.

11 gauge steel to ASTM A1011SS is the heavy-wall spec used on seismic-rated open frames, and it is what lets the frame carry loaded network gear over a 108 inch height rather than the lighter gauge used on light-duty relay racks. For heavy deep servers, note this is an open two-post frame, so long chassis need rack-mount rails or a shelf rather than front-flange support alone.

The finish is Telco gray powder coat, the standard gray used across Eaton B-Line open frame racks and most telecom frames, so it lines up with existing telco gray racks and runway in a room. Powder coat over steel also holds up to being knocked by gear during a build better than a wet paint finish.