When building a data center or an audiovisual (AV) system, much of the attention goes to core hardware such as servers, switches and audio processors, while the physical framework that supports it all — the rack — is often overlooked. A well-designed rack is more than a container for equipment: it is a decisive factor in equipment lifespan, cooling efficiency and the difficulty of ongoing maintenance.
Industry guidance on rack selection treats the enclosure as an engineered component of the system, not an afterthought purchased at the end of a project.
Rack selection begins with the requirement
Choosing a rack is not simply a matter of buying a cabinet. It requires matching the enclosure to the characteristics of the equipment it will house. Within the Legrand Middle Atlantic range, selection typically centers on four core dimensions:
rack units (U) of height, internal depth, width and load capacity.
The standard 19-inch EIA rail is the common industry baseline, but models differ markedly in the scenarios they are built for.
| Rack series |
Typical application |
Core characteristics |
| MRK |
Shared and public spaces |
Enclosed construction with strong thermal management and security |
| SNE |
High-density servers |
Greater depth for large server payloads |
| DRK |
Network cabling hubs |
Open frame for frequent patching work |
| VMRK |
Servers and storage |
Extra depth to accommodate modern deep-server chassis |
| NVR/DVR |
Surveillance and AV equipment |
Preconfigured and optimized for continuous recording and storage |
Logistics and installation: the hidden cost
Many projects discover only after equipment arrives that the rack will not fit through the door. The enclosure is not merely an IT question; it is a building logistics question. Before an order is placed, the following checklist should be confirmed:
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Load assessment: verify that the fully loaded rack weight does not exceed the structural limits of the floor slab or raised floor.
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Path of travel: measure the width of every door frame along the route, elevator load ratings and turning radii to ensure an assembled rack can reach the installation point.
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Site conditions: once in position, the rack must be leveled, bonded to ground and given sufficient service clearance for the front and rear doors to open.
These checks are typically inexpensive at the planning stage and costly to correct once equipment has been delivered.
Cooling and operations: the rack's long-term value
The cost of a rack is not confined to its purchase price; it extends across the full lifecycle of thermal management and operational efficiency. Sound airflow management — sealing gaps, using blanking panels to fill empty U positions and selecting doors according to the heat load — can meaningfully lower equipment operating temperatures, extending hardware life and reducing air-conditioning energy consumption.
Disciplined cabling is equally central to reducing mean time to repair (MTTR). In racks of adequate depth, vertical cable managers keep runs organized and, more importantly, ensure that later equipment swaps or capacity expansions are not obstructed by congested cabling that blocks airflow or invites handling errors.
Frequently Asked Questions
How can you tell whether a rack is deep enough?
Beyond the chassis depth of the servers or equipment, additional space must be reserved for power distribution units (PDUs), cable management arms and cable bend radius. Insufficient depth forces cables to be crushed against the rear door, which seriously compromises airflow and increases the risk of cable damage.
Why are open frames such as the DRK preferred in network cabling rooms?
In a network cabling hub, technicians frequently patch, move and add connections. An open frame removes the barrier of doors and provides unobstructed front and rear access, which substantially improves day-to-day maintenance efficiency.
If a rack is already installed, can cooling problems still be corrected?
Retrofits are possible — adding blanking panels, brush-strip entries or replacing the door with a ventilated model — but the cost and installation difficulty are far higher than specifying these options on the original order. Airflow management should be determined at the planning stage according to the heat load.
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