Vertiv GL790ES-3048-B-MSS 42U 30" x 48" Black Server Cabinet with Split Mesh Rear Door
Overview
The Vertiv GL790ES-3048-B-MSS is a 42U, 30-inch-wide by 48-inch-deep open-frame server enclosure finished in black, configured with a split mesh rear door. It belongs to Vertiv's Geist/GL enclosure line — a rack series sized for dense network closets and small data center rows where depth headroom matters and cable management can't be an afterthought. The GL790ES-3048-B-MSS (often searched as GL790ES 3048 B MSS) is the specific SKU that pairs 30-inch width with 48-inch depth, black finish, and a split rear door — a combination that suits mid-density switching or server builds where rear cable access needs to be staged independently on left and right halves.
Key Features
- 42U Height: 42U provides roughly 73.5 inches of usable rail space — enough to stack a top-of-rack switch, a patch panel tier, a UPS module, and a full complement of 1U servers without running out of space. For most single-rack deployments, 42U is the industry-standard height that avoids both the wasted space of a 48U and the constraints of a 45U in low-ceiling environments.
- 30-Inch Width: The 30-inch body (wider than the 24-inch telecom-standard, narrower than 32-inch heavy-compute variants) is the right fit for equipment with side cable managers or wider blanking panels. It also leaves more aisle clearance in tight server rooms than a 32-inch rack without sacrificing usable interior width for most standard EIA-310 components.
- 48-Inch Depth: At 48 inches of internal depth, the GL790ES-3048-B-MSS comfortably houses full-depth servers and storage arrays — most 2U compute nodes and 4U storage heads fit with room for structured rear cabling. If your gear is 29–36 inches deep, this depth prevents cable pinch at the rear door and leaves a clear service lane.
- Black Finish: The black powder coat is the standard finish for production data center and server room environments, where color consistency across racks matters for visual organization. Winter White is available in other SKUs if your environment requires it — but for most deployments, black is the correct choice.
- Split Mesh Rear Door: The split rear door opens in two independent halves rather than as a single swing. In a dense row, a full-swing single rear door can block the hot aisle or require partial row shutdown to service a single rack. The split configuration lets you open just one side — left or right — without disturbing cabling or airflow on the opposite half. The mesh panel maintains passive airflow through the rear without restricting exhaust from high-density compute.
- Mesh Contour Front Door: The front door uses a mesh contour profile, which supports unobstructed intake airflow from the cold aisle to equipment air inlets. This matters if you're not in a fully contained hot-aisle/cold-aisle setup — mesh front doors reduce the delta-T buildup that solid doors create in semi-open environments.
Integration and Compatibility
The GL790ES-3048-B-MSS is built to EIA-310 rail standards, making it compatible with standard 19-inch rackmount equipment across compute, networking, and power categories. The 48-inch depth accommodates full-depth 1U, 2U, and 4U chassis from major compute and storage vendors. The split rear door design is particularly well-suited to environments where structured rear cable management is already in place — the two independent panels won't disturb existing cable routing when servicing equipment on one side of the rack. For airflow planning, the mesh front and split mesh rear work as a matched pair in hot-aisle/cold-aisle rows, or in semi-contained deployments using blanking panels to direct airflow. Pair this enclosure with rack PDUs and cable management accessories sized to the 30-inch interior for a clean build. Browse the full Vertiv enclosure and power catalog for compatible accessories, or explore server racks and enclosures to compare form factors across the line. If you're planning a multi-rack row, review data center infrastructure options for containment, busway, and airflow management components that pair with this cabinet.
Frequently Asked Questions
Q: What is the usable rack unit capacity of the GL790ES-3048-B-MSS?
A: This cabinet is 42U in height, providing 42 standard rack unit positions for mounting EIA-310-compatible equipment.
Q: What are the external dimensions of the GL790ES-3048-B-MSS?
A: The cabinet is 30 inches wide and 48 inches deep. These are the key footprint dimensions for floor planning. Overall external height will be taller than the 42U usable space due to the top cap, leveling feet, and casters if installed.
Q: Why choose the split rear door configuration over a single rear door?
A: A split rear door lets you open the left or right half independently. In a populated row, this means you can access rear cabling or equipment on one side without swinging a full door into the hot aisle or disturbing the opposite side's cable management.
Q: Is the GL790ES-3048-B-MSS available in colors other than black?
A: The GL790 enclosure family is available in black and Winter White finishes. The GL790ES-3048-B-MSS specifically is the black variant. A separate SKU covers the Winter White finish if your environment requires it.
Q: What door types are available in the GL790 enclosure line?
A: The GL790 line offers Mesh Contour Front with Mesh Contour Rear, Mesh Contour Front with Split Mesh Rear (as on this unit), and Clear door configurations. Door selection depends on airflow requirements and visibility needs.
The GL790ES-3048-B-MSS is the configuration I reach for when a client needs a 42U build with rear service access in a populated row — specifically because the split mesh rear door means you can work one side of the cabinet without pulling the door fully open into the aisle. At 30 inches wide and 48 inches deep, this enclosure fits the large majority of 1U and 2U compute and switching gear without the depth constraints that trip up integrators who spec a 42-inch-deep cabinet for a mixed environment.
Technical Highlights:
- 30" Width: Wider than the 24-inch telecom standard — creates clearance for side cable managers on both rails without crowding internal mounting depth, which matters when you're managing structured copper and fiber in the same bay.
- 48" Depth: Accommodates full-depth servers and storage heads that run 36–40 inches with room for rear cable radius management — the spec that prevents crushed patch cords and blocked exhaust ports in dense builds.
- Split Mesh Rear Door: Each door half operates independently; in a hot-aisle-contained row, you open only the panel covering the equipment you're servicing, keeping the containment barrier intact on the other half.
Deployment Considerations:
- Verify your floor tile cutout and cable tray run against the 30-inch width before ordering — 30-inch cabinets require different tile punches than 24-inch or 32-inch configurations, and retrofitting aisle containment curtains to a mixed-width row adds cost.
- The mesh rear door supports passive exhaust — if you're running high-density blade or GPU compute that demands active rear door heat exchangers, this door configuration is not the right match and you'd need a different enclosure variant.
This cabinet is the right fit for a small data center row or dedicated network/server closet running mid-density switching and compute — specifically where rear cable access needs to be staged independently and airflow can be managed passively through mesh front and rear panels.
