B-Line Eaton series open racks, Steel, Yellow zinc, 12-24 panel mounting holes, 43 mounting spaces, Throat style, Seismic Zone 4, closed duct unequal

Yes. The SB5761140YZ is a 19 inch wide open frame rack, which is the standard EIA panel width, so any 19 inch rack-mount patch panel, switch, or shelf mounts to it. The rails are drilled and tapped for 12-24 panel mounting holes, so you fasten equipment directly with 12-24 rack screws rather than using cage nuts.

43 mounting spaces means 43 rack units of usable mounting height, so you can populate it with any mix of gear whose combined RU count is 43 or less. A common data closet build, for example, is several 2U 48-port patch panels, 1U switches, and horizontal cable managers between them. Count your RUs before ordering, because open frame racks do not gain space the way a cabinet can with a taller frame.

The SB5761140YZ is built as a Seismic Zone 4 rack, which is the highest of the legacy seismic zone classifications and the one that covers most of California. It is also UL Listed. Zone 4 rated frames are what specifiers call out for hospitals, schools, and other essential facilities in high seismic areas. The rack still has to be anchored to the slab and, where the design calls for it, braced at the top per the structural engineer's detail.

Unequal flange means the two legs of the rack channel are different depths, so the mounting rail sits back from the front face and leaves a channel alongside the equipment. Closed duct means that channel is enclosed, giving you a protected vertical pathway to run patch cords and power cord up and down the rack instead of strapping them to the outside of the frame. If you want a bare, fully open frame with no integrated raceway, that is a different rack style.

An open frame rack such as the SB5761140YZ gives you access from all four sides and unrestricted airflow, which is why it is the normal choice for a locked telecom or MDF room where the door provides the security. Pick an enclosed cabinet instead when the equipment sits in a shared or public space and needs to be locked, or where you need to contain dust and control airflow through fans and filters. Open frame also makes cable dressing faster, and the closed duct on this frame gives you the vertical pathway a cabinet would provide with a side channel.

No. The SB5761140YZ is steel with a yellow zinc plating, which is a light corrosion resistant coating meant for dry indoor use in telecom rooms, electrical rooms, and equipment closets. For outdoor, wash-down, or coastal exposure you want a rack in stainless or a hot dip galvanized or powder coat over galvanized finish, not yellow zinc plate.

The rack weighs 131 lb as shipped, which is a two-person lift to stand upright and position. Plan on two installers, a floor anchor layout marked before the frame goes up, and anchors rated for the seismic detail on your drawings, since a Zone 4 frame is only as good as its attachment to the slab.

No cage nuts. The rails come with 12-24 tapped panel mounting holes, so equipment fastens with standard 12-24 rack screws. If your gear shipped with M6 or 10-32 hardware it will not thread here, so order 12-24 screws to match. Cage nut style square-hole rails are a different product.

Order Eaton B-Line model SB5761140YZ. That number covers the throat style, Seismic Zone 4, closed duct unequal flange steel rack in yellow zinc with 43 mounting spaces and 12-24 tapped rails. The YZ suffix identifies the yellow zinc finish, so a different finish on the same frame carries a different suffix.