Artificial intelligence workloads are fundamentally reshaping data center physical infrastructure. The rise of high-density deployments, routinely exceeding 40 to 60 kW per rack and pushing past 100 kW in AI training environments, is forcing operators to rethink their very foundation.

To support these intense workloads, the modern rack must evolve into an integrated ecosystem which actively supports thermal management, cable routing, and physical security. This foundation, in turn, should seamlessly integrate with strategic containment aisles to create a complete, high-performance solution for AI-capable data halls.

The High-Density Challenge

AI and other compute-intensive workloads place unprecedented demands on racks and cabinets, creating four critical challenges:

• Thermal Management Under Extreme Loads: High-density racks generate intense heat that could exceed the limits of what traditional airflow designs can handle. Effective temperature management is paramount to minimize hot spots and maximize cooling efficiency. Without proper support from both the rack and its surrounding containment aisles, operators face significant risks of component throttling, failure, and other heat-related crises.
• Load-Bearing Requirements: AI infrastructure relies on heavy-duty components like powerful GPUs and specialized hardware. A single NVIDIA DGX H100 server, for instance, weighs nearly 300 lbs (136 kg), and a fully populated rack can exceed 3,000 lbs (1,360 kg). AI-ready racks therefore demand reinforced frames and mounting rails engineered to bear these extreme static and dynamic loads safely.
• Spatial Demands: As rack complexity increases, so does the demand for larger form factors. Organizations are looking at taller rack sizes (48U to 52U) and greater widths to maximize space, especially in older data centers with limited floor space. For new builds, the Legrand Data Center Solutions team has been seeing a growing demand for purpose-built racks that move beyond the standard 24-inch (600mm) width to accommodate deeper equipment and advanced cooling accessories.
• Cable Management and Accessibility: An AI-supporting rack can host up to ten times more cables than a traditional one, creating a complex web that can impede airflow, complicate maintenance, and increase the potential for error. Built-in cable management is no longer a luxury but a necessity, enabling teams to streamline current setups and accommodate future changes with ease.

How Legrand’s Racks and Cabinets Are Engineered to Solve the AI Challenge

Legrand’s rack and cabinet solutions are designed from the ground up to meet these high-density demands head-on:

• Enhanced Thermal Performance and Airflow Management: Our high-density server cabinets feature optimized perforation patterns (80% on front and rear doors) and a suite of airflow management accessories. These components create best-in-class airtight seals within the cabinet and at its interfaces, ensuring cold air remains in the rack as long as possible for maximum thermal efficiency.
• High Load Capacity and Scalability: With robust load ratings up to 1,500 kg, Legrand cabinets are built with solid, lightweight aluminum frames capable of housing the heaviest GPU arrays. Integrated T-slots allow for stepless width and depth adjustments, facilitating future capacity upgrades without major rework. Nearly all accessories are accessible from inside the cabinet, simplifying maintenance and reconfigurations.
• Integrated Cable Management: Our solutions include built-in vertical and horizontal cable management, including ducts, trays, and rings, designed for both copper and fiber cabling. This keeps pathways clear to facilitate critical airflow while simplifying moves, additions, and changes.
• Seamless Integration with Containment: Legrand racks are engineered to integrate effortlessly into both hot and cold aisle containment systems, allowing operators to choose the optimal cooling strategy for their specific density profile.

The Importance of Hot and Cold Aisle Containment Strategies

The choice of containment strategy is inseparable from rack selection. The right approach can increase cooling efficiency by up to 35%, enabling higher densities without expanding overall facility cooling capacity. Legrand currently offers a wide range of rack-supported, ground free-standing and hanging free-standing containment systems to suit diverse facility needs, all customizable to fit space requirements or limitations.

Cold Aisle Containment (CAC)

• Best for: Legacy or mixed-density facilities with moderate density (under 30 kW per rack).
• Benefits: Contains and delivers cooled air through raised floors directly to cabinet aisles, reducing CRAC workload and preventing overcooling for a better PUE. It offers a lower investment and is simpler to implement for retrofits.

The Legrand Advantage: When paired with our airflow-sealed cabinets, CAC prevents cool air from bypassing equipment, ensuring every watt of cooling is directed precisely where it is needed in transitional or mixed-density environments.

Hot Aisle Containment (HAC)

• Best for: New builds or high-density zones (over 30kW), ideally with liquid-assisted cooling deployed as a complement.
• Benefits: Isolates the flow of hot exhaust air in aisles from the rest of the room, allowing cooling units to operate at higher, more efficient setpoints for a lower PUE. It integrates seamlessly with advanced cooling measures like rear-door heat exchangers

The Legrand Advantage: Combined with Legrand cabinets and rear-door heat exchangers, our HAC solutions are engineered to handle extreme AI heat loads without overtaxing the facility's core cooling infrastructure.

Conclusion

In the AI era, the ideal rack needs to be a high-performance ecosystem. It must master airflow, cabling, and structural load while integrating seamlessly into broader containment and cooling strategies. Legrand’s racks and cabinets are purpose-built to anticipate these demands, offering structural strength, airflow optimization, and modularity that high-density AI environments require. Paired with the right containment approach, they provide a solid foundation for a scalable, reliable, and energy-efficient AI-ready infrastructure.