Vertiv GL840CL-3036-2MM 2x21U Colocation Cabinet
Overview
The Vertiv GL840CL-3036-2MM is a dual-bay, 2x21U colocation cabinet configured at 30 inches wide and 36 inches deep in a black finish — sized for deployments where per-tenant isolation matters and floor space is at a premium. The 21U-per-bay layout suits co-location environments where cabinet space is allocated, billed, and locked independently per customer, making clean physical separation a baseline operational requirement rather than a convenience. If you are sourcing cabinets for a multi-tenant data center build-out, a colo cage refresh, or a shared infrastructure room, this model is engineered for that context.
The GL840CL-3036-2MM (also searched as GL840CL 3036 2MM) ships with flexible door configurations: mesh front and rear for maximum passive airflow, a plexi front option where visibility into active equipment is operationally useful, and a solid rear with two integrated fans for environments that need directed exhaust rather than open convection. Each configuration addresses a different thermal management philosophy — mesh for open hot-aisle/cold-aisle arrangements, solid-with-fans for contained or mixed-density rows.
Bay count options — two, three, or clear — give rack managers the ability to configure internal compartmentalization to match tenant contracts or equipment ownership boundaries without retrofitting aftermarket dividers.
Key Features
- 2x21U Dual-Bay Layout: 21U per bay means each tenant or business unit gets a full usable half-cabinet — enough headroom for a dense 1U server stack, patch panel tier, and PDU without competing for rack space with an adjacent customer.
- 36-Inch Depth: Accommodates standard 1U and 2U servers with rear cabling clearance. The 36-inch footprint is the baseline for most enterprise compute equipment; verify deeper chassis (typically 28–32 inches) leave adequate airflow margin before ordering the 36-inch depth versus the 42-inch or 48-inch variants.
- Multiple Door Configurations: Mesh front/rear maximizes passive airflow and suits high-density rows on a raised floor. Plexi front preserves sightlines for indicator lights and drive activity without opening the enclosure. Solid rear with two fans suits contained thermal zones where directed exhaust to a rear plenum is required.
- Flexible Bay Options: Two-, three-, or clear-bay configurations let facility managers match physical compartments to contractual tenant boundaries or equipment ownership lines — reducing access disputes and simplifying audits.
- Black Finish: Standard for modern data center and colocation environments; maintains visual consistency across mixed-vendor cabinet rows.
Deployment Context
This cabinet fits best in colocation facilities, enterprise server rooms, and shared infrastructure environments where per-tenant physical separation, standardized airflow management, and flexible internal compartmentalization are non-negotiable. Verify ceiling height, raised-floor tile layout, and aisle containment design before committing to door configuration — the door type you specify at order affects thermal performance across the full row, not just a single cabinet.
For installations with higher-density compute (blade chassis, high-wattage GPU nodes), evaluate whether the 36-inch depth and mesh door configuration provide adequate rear cabling clearance and exhaust path, or whether the 42-inch or 48-inch depth variants better suit your chassis mix. Consult the Vertiv cabinet and enclosure line for the full depth and configuration matrix, and review your data center cabinet options alongside aisle containment accessories before finalizing an order.
Frequently Asked Questions
Q: What does the 2x21U configuration mean for the GL840CL-3036-2MM?
A: The cabinet is divided into two independent bays, each providing 21U of rack space. This is standard in colocation environments where physical separation between tenants or business units is required — each bay can be locked and managed independently.
Q: What door options are available for the GL840CL-3036-2MM?
A: The cabinet supports mesh front and rear doors (best for passive airflow in hot-aisle/cold-aisle rows), a plexi front (useful where equipment indicator visibility is needed), and a solid rear door with two integrated fans (suited for contained thermal zones with directed exhaust).
Q: What depth variants exist beyond the 36-inch version?
A: The GL840CL series is available in 36-inch, 42-inch, and 48-inch depths. The 36-inch depth suits most standard 1U/2U server equipment; deeper chassis or high-density blade systems may require the 42-inch or 48-inch variant to maintain adequate rear cabling clearance and airflow.
Q: What bay configurations are offered?
A: The GL840CL-3036-2MM is available in two-bay, three-bay, and clear (open) bay configurations. The choice depends on how many independent compartments are required for tenant separation or internal equipment ownership boundaries.
Q: Is the GL840CL-3036-2MM suitable for high-density compute environments?
A: At 36 inches deep with 21U per bay, it accommodates standard enterprise compute. For blade chassis or high-wattage GPU nodes, evaluate rear cabling clearance and consider whether the solid-rear-with-fans door configuration or a deeper depth variant is more appropriate for your thermal load.
The GL840CL-3036-2MM is one of those cabinets that looks straightforward on paper — 2x21U, 30-inch wide, 36-inch deep — but the configuration decision that actually matters most is the door type, not the depth. I've seen colo operators order mesh-rear doors because they looked 'open and airflow-friendly,' then watch thermal runaway hit the rear of the row when they didn't have aisle containment in place to back it up.
Technical Highlights:
- Dual 21U Bays: Each bay is an independently managed 21U compartment — the right unit count for a standard colo tenant allocation that includes a patch panel tier, a couple of 1U servers, and a horizontal PDU without fighting for space.
- 36-Inch Depth: Seats standard 1U and 2U rack-mount equipment with clearance for rear cabling. If you're pulling in chassis that run 28–30 inches deep, the 36-inch shell leaves a workable cable management zone; anything longer and you're looking at the 42-inch variant.
- Solid Rear with Dual Fans: Where this door option earns its place is in mixed-density rows without a formal cold-aisle containment system — the fans provide positive exhaust pressure that mesh doors simply can't guarantee in an open environment.
Deployment Considerations:
- Door configuration is essentially permanent post-install in a live colo row — spec the right option for your airflow architecture before the cabinet goes on the floor, not after tenants are cabled in.
- The 36-inch depth is the minimum in this series; if your equipment mix includes any chassis over 28 inches, measure rear cable tray clearance explicitly before committing to this depth over the 42-inch or 48-inch variants.
This cabinet is a strong fit for managed colocation builds where tenant contracts require documented physical separation, the equipment mix is standard 1U/2U compute, and the facility already has a defined airflow containment strategy in place.
