Vertiv GL840ES-3048-B-MS 44U 30”x48” Black Mesh Enclosure

The Vertiv GL840ES-3048-B-MS is a 44U, 30-inch-wide by 48-inch-deep rack enclosure from the Geist ES series — a commercial-grade cabinet built for data center rows, server rooms, and network equipment deployments where you need a standardized, scalable enclosure with real airflow management built into the door design. The 44U height gives you room for dense server or network builds without going to a full 52U tower, and the 30”x48” floor footprint fits most raised-floor and on-slab installations without layout rework.

Key Features

• 44U Usable Height: 44 rack units accommodates a high-density mix of 1U switches, 2U servers, patch panels, and PDUs in a single cabinet — enough headroom for a fully built-out edge stack without the wasted vertical space of a 52U when you don’t need it.
• 30” Width: The 30-inch width (versus a narrower 24-inch cabinet) provides better side clearance for cable management arms and wider equipment like certain UPS units or storage arrays. If your floor plan is tight, confirm aisle width before ordering — 30” wide plus door swing can close off a 24” cold aisle.
• 48” Depth: A 48-inch depth comfortably houses front-to-back cable runs and deep 2-post or 4-post equipment without forcing bend-radius violations at the rear. Most modern blade chassis and hyper-converged nodes fit cleanly at this depth.
• Mesh Contour Front / Split Mesh Rear Doors (MS configuration): The mesh door design promotes passive airflow, reducing hot-spot risk compared to solid doors in environments without precision cooling. Split rear doors simplify rear cable access in tight rows — you open half a door instead of swinging a full panel into the next cabinet or aisle.
• Black Finish: The black (B) color designation matches standard data center aesthetics and is consistent with most hot-aisle/cold-aisle row builds. Winter White is available in the same family for raised-floor environments where light-colored cabinets are preferred.
• ES Series Platform: The Geist ES line is designed for compatibility with Vertiv’s PDU, cable management, and blanking panel accessories — useful when you’re standardizing a multi-rack deployment and need consistent accessory fitment across the row. Browse the Vertiv product catalog for compatible PDUs and accessories.

Integration & Compatibility

The GL840ES-3048-B-MS is a passive enclosure — it does not include integrated power distribution, cooling, or monitoring out of the box. Plan your PDU selection, cable management, and blanking panel counts separately. The 44U height and 30”x48” footprint are standard EIA-310 rack unit dimensions, so third-party rails, shelves, and sliding trays will mount without modification in most cases. If you’re deploying in a server rack and enclosure row alongside existing Vertiv gear, the ES series accessory ecosystem covers brush strips, side panels, and horizontal managers that mount natively.

For NVR-based video surveillance deployments, this cabinet provides adequate depth for rack-mount NVR appliances and associated network switches — pair it with a rack-mount NVR and a managed PoE switch to complete the stack. Consult your rack planning guide for load calculations before finalizing rail and shelf selections.

Frequently Asked Questions

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

A: The MS suffix indicates a Mesh Contour front door paired with Split Mesh rear doors. This configuration supports passive front-to-back airflow and allows rear access without swinging a full-width panel.

Q: Is the GL840ES-3048-B-MS compatible with Vertiv PDUs and cable management accessories?

A: The GL840ES-3048-B-MS is part of the Geist ES enclosure series, which is designed to work with Vertiv’s PDU mounting, cable management, and blanking panel accessories. Confirm part numbers against the ES accessory guide before ordering.

Q: What is the difference between the 30” and 32” width options in the ES series?

A: The 30” width (this unit) suits the majority of standard server and network equipment. The 32” variant provides additional side clearance for cable management arms or oversized equipment. The GL840ES-3048-B-MS is the 30” configuration.

Q: Can the GL840ES-3048-B-MS be used in open-aisle data center deployments?

A: Yes. The mesh door design supports natural airflow in both open-aisle and hot-aisle/cold-aisle containment setups. For full containment architectures, verify that Vertiv’s compatible top panel and aisle containment accessories are available for the ES series.

Q: Does this cabinet ship assembled or flat-packed?

A: Vertiv ES series cabinets typically ship partially assembled. Confirm shipping configuration and freight class with your order, as 44U cabinets may require liftgate or dock delivery.

Ted Perry

The GL840ES-3048-B-MS is one I recommend specifically when an integrator needs a 44U cabinet with split rear doors — that MS door config is the spec that matters most in dense rows where full rear-door swing isn’t practical. The 30”x48” footprint hits the sweet spot for most commercial and enterprise builds without the floor-space penalty of a 32” wide unit.

Technical Highlights:

• 44U Height: Gives you enough rack real estate for a complete NVR stack, PoE switching layer, and patch infrastructure in one cabinet — without going to 52U and adding unnecessary height in low-ceiling server rooms.
• 48” Depth: Accommodates the full depth of current-generation blade servers and rack-mount appliances without rear cable crush. Most hyper-converged nodes and 2U/4U servers land cleanly inside this depth.
• Split Mesh Rear (MS): Half-door rear swing is a real operational advantage in a populated row — you’re not fighting a full rear panel in a 24” hot aisle every time you need rear port access.

Deployment Considerations:

• The 30” width requires you to account for door swing clearance in aisle planning — in a 24” cold aisle this becomes tight; verify aisle width before locking in the floor plan.
• The GL840ES-3048-B-MS is a passive enclosure with no PDU, cable management, or blanking panels included — budget those line items separately, and size your PDU to the actual load before ordering rails.

This cabinet is a solid fit for a mid-density surveillance or IT infrastructure rack build in a purpose-built server room or edge data closet — specifically where split rear door access and a standard 30” width make row management practical without custom aisle modifications.