Vertiv GL840ES-3048-B-MSS 44U 30" x 48" Black Server Enclosure with Split Mesh Rear Door

The Vertiv GL840ES-3048-B-MSS is a 44U, 30-inch-wide by 48-inch-deep server enclosure finished in black, configured with a mesh contour front door and a split mesh rear door. It belongs to Vertiv's Vertiv rack enclosure line — a family that spans multiple height, width, and depth configurations to cover everything from compact edge deployments to full-density data center rows. The split rear door designation (GL840ES-3048-B-MSS, sometimes searched as GL840ES 3048 B MSS) is the defining feature that separates this unit from same-size siblings with a solid or single-panel rear.

Overview

At 44U, this enclosure accommodates a fully loaded server stack — dual top-of-rack switches, patch panels, 1U/2U servers, and dense storage shelves — without the forced compromise of a 42U chassis. The extra 2U matters most when you're retrofitting an existing design: it provides clearance for cable management accessories or a second PDU tier without bumping a server offline. The 30-inch width hits the sweet spot for most EIA-310-compliant equipment; go wider only if your airflow baffles or side cable channels demand it. The 48-inch depth accommodates current-generation 2-socket rack servers (which commonly run 29–33 inches body depth plus cabling egress), leaving workable space front and rear for power and data cable routing without forced bending.

Key Features

• Split Mesh Rear Door: Two independently hinged rear panels let you open one side without swinging the full door width into a neighboring rack or aisle obstacle. In dense rows where rear clearance runs tight, this is a practical daily-operations benefit — cable access, PDU swaps, and drive pulls without relocating adjacent equipment.
• Mesh Contour Front Door: The perforated front door keeps the enclosure locked and visually uniform while passing airflow directly through the face of the rack. No blanking-panel games required to maintain positive-pressure front-to-back airflow in a CRAC-cooled room.
• 44U Usable Height: Two rack units above the common 42U baseline gives you room for a dedicated cable manager at top or bottom without sacrificing a server slot. In camera-head-end and NVR rack builds, that extra pair of U is often the difference between a clean install and a compromise layout.
• 30-Inch Width: Fits within standard data center floor tile spacing (600mm or 24-inch grid) while leaving side clearance for vertical cable managers or narrow aisle containment hardware. Wider than a 24-inch rack but narrower than a 32-inch unit, it is the most common footprint in commercial IT and physical security head-end rooms.
• 48-Inch Depth: Deep enough for back-to-back dense server and storage configurations without cable snagging at the rear door. Shallower racks (42-inch) increasingly conflict with large 2U servers plus cable dressing; 48-inch avoids that problem on modern hardware generations.
• Black Finish: Matches the dominant color convention in modern data centers and security operations centers. Black enclosures read as lower-reflectance under fluorescent/LED overhead lighting, which reduces glare for technicians working in front of open racks for extended periods.
• Multiple Configuration Options in Family: The GL840ES series is available in 24U, 42U, 44U, 48U, and 52U heights; 24-inch, 30-inch, and 32-inch widths; and 42-inch or 48-inch depths. If your floor plan or equipment list changes before rack installation, specifying within this server rack enclosure family keeps procurement on a single vendor platform with interchangeable accessories.

Integration and Compatibility

The GL840ES-3048-B-MSS accepts standard EIA-310-D 19-inch rack-mount equipment across all 44U of usable height. The 30-inch interior width accommodates equipment up to 19 inches wide plus standard rail sets. At 48 inches of interior depth, the enclosure is compatible with most current rack PDUs, both 0U vertical and 1U horizontal form factors, without requiring rail or shelf repositioning. Cable entry is front, rear, and typically top/bottom depending on site-supplied knockouts and blanks — confirm with your facility's raised-floor or overhead cable pathway geometry before finalizing rack orientation. For physical security head-end builds — NVR stacks, video management servers, network switching, and UPS — the 44U depth gives you enough height to keep like equipment grouped by function without interleaving unrelated systems. Pair with a compatible rack PDU for clean power distribution within this enclosure.

For environments where cable management is a primary concern, Vertiv offers compatible vertical and horizontal cable managers within the GL840ES accessory ecosystem. Consult your rack accessories selection for zero-U and 1U cable management options confirmed for this enclosure width.

Frequently Asked Questions

Q: What is the usable rack unit height of the GL840ES-3048-B-MSS?

A: The GL840ES-3048-B-MSS provides 44U of usable rack space. This is two units above the common 42U baseline, which provides additional flexibility for cable managers or PDU mounting without sacrificing equipment slots.

Q: What door configuration does the GL840ES-3048-B-MSS ship with?

A: It ships with a mesh contour front door and a split mesh rear door. The split rear means two independently hinged panels — you can open one side without swinging the full rear door width, which matters in tight aisle or wall-adjacent installations.

Q: Is the GL840ES-3048-B-MSS available in other sizes or colors within the same family?

A: Yes. The GL840ES series spans 24U, 42U, 44U, 48U, and 52U heights; 24-inch, 30-inch, and 32-inch widths; 42-inch or 48-inch depths; and black or Winter White finishes. The GL840ES-3048-B-MSS is the 44U/30-inch/48-inch/black/split-rear-door variant.

Q: What type of equipment fits in the GL840ES-3048-B-MSS?

A: Any standard EIA-310-D 19-inch rack-mount equipment up to 44U cumulative height. The 48-inch depth accommodates current-generation 2U servers with deep chassis plus rear cabling, as well as 0U vertical PDUs and standard horizontal cable managers.

Q: Does the mesh door design affect airflow or cooling performance?

A: The mesh contour front door is perforated to allow front-to-back airflow to pass through without restriction, supporting CRAC or in-row cooling architectures. The split mesh rear door similarly does not block exhaust air — both doors maintain open airflow paths that a solid-door enclosure would interrupt.

Q: Can the GL840ES-3048-B-MSS be used in a physical security or surveillance head-end room?

A: Yes. The 44U height and 48-inch depth make it well suited for NVR stacks, video management servers, PoE switches, and associated UPS units in a security operations head-end. The split rear door is particularly useful in these environments where rear cable access is frequent during commissioning and ongoing maintenance.

Jerry Tildsen

The GL840ES-3048-B-MSS is the enclosure I reach for when a build needs 48-inch depth and the team knows rear cable access will be a recurring event — not a one-time commissioning task. The split mesh rear door is not a cosmetic variation; on a rack installed within 24 inches of a wall or in a two-post aisle with containment curtains, swinging a full-width rear door open is a genuine operational problem. Two half-panels solve it cleanly.

Technical Highlights:

• 44U Height: Two extra rack units over the standard 42U baseline — enough to add a 1U horizontal cable manager at top and still run a full 42U of active equipment. In head-end security builds with a mix of NVRs, switches, and patch panels, those two units routinely prevent last-minute layout compromises.
• 48-Inch Depth: Sized for modern 2U servers that run 30-plus inches of chassis depth before cabling. At 42-inch depth, you're forcing cable dressing into the rear door clearance zone; at 48 inches, there's room to dress power and data separately without tight bends that degrade SFP+ signal integrity.
• Mesh Contour Front and Split Mesh Rear: Both doors are perforated — front-to-back airflow is unobstructed. In a room relying on precision CRAC cooling, blanking panels do the sealing work and the doors stay out of the thermal equation entirely.

Deployment Considerations:

• The 30-inch width fits within a standard 600mm floor tile grid, but verify your raised-floor cutout dimensions before delivery — a 30-inch enclosure with vertical cable managers attached can exceed the tile opening width at the base.
• The GL840ES-3048-B-MSS ships as a specific configuration (44U/30in/48in/black/split rear). If your site spec calls for 42U or a 42-inch depth variant, order the correct model from the GL840ES family at procurement — field modification of rack height is not a practical option post-delivery.

This enclosure is best positioned for security operations center head-end rooms, mid-density server rooms, and NVR-heavy surveillance infrastructure builds where depth, split rear access, and airflow-friendly doors are the three criteria that move the needle on deployment quality.