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Data Center Server Room Air Ducts

Fiber and communications infrastructure knowledge brief Published 21 Aug 2023

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Air ducts in data centers are critical for precise airflow management, cooling efficiency, and energy optimization, with modern systems favoring adjustable fabric ducts for flexibility and uniform air distribution.

Purpose of Air Ducts in Data Centers

Air ducts in server rooms and data centers are designed to deliver cooled air to server inlets and remove hot exhaust air efficiently, maintaining consistent temperatures and preventing hot spots that can damage equipment or reduce performance. Proper ducting ensures that high-density racks, including blade servers with power densities exceeding 15 kW per rack, receive sufficient airflow without overworking CRAC/CRAH units.

Types of Duct Systems

Metal Ducts

Traditional metal ducts are rigid and durable but difficult to reconfigure once installed. They can create uneven airflow and require significant downtime for modifications. Metal ducts are often paired with raised floor systems to deliver conditioned air through perforated tiles.

Fabric Ducts

Modern data centers increasingly use fabric or textile ducts due to their lightweight, modular, and customizable design. Fabric ducts can: Deliver large volumes of air at low velocities to cold aisles, reducing hot air entrainment. Include adjustable nozzles and internal dampers for precise airflow targeting.

Be installed overhead, wall-mounted, or underfloor, making them suitable for tight spaces or modular layouts. Reduce construction costs and improve Power Usage Effectiveness (PUE) by minimizing the need for physical containment.

Airflow Management Techniques

Effective ducting integrates with hot-aisle/cold-aisle containment strategies and may include: Targeted air dispersion to maintain consistent inlet temperatures along aisles. Powered floor tiles or PAC hoods to enhance airflow to specific racks without moving equipment. Vertical blanking panels to prevent hot air recirculation within racks.

Thermostatically controlled systems to adjust airflow dynamically based on server load.

Design Considerations

When designing data center duct systems, key factors include: Minimal pressure drop to ensure efficient airflow. Thermal insulation to prevent condensation and maintain temperature control. Low-leakage construction and precision dampers for energy efficiency.

Modularity and scalability to accommodate future expansions or reconfigurations. Fire-retardant, antistatic, and antimicrobial materials for safety and longevity.

Benefits of Modern Ducting Solutions

Uniform air distribution reduces hot spots and improves server reliability. Lower air velocities reduce energy consumption and stress on hardware. Flexible installation allows retrofitting or relocation without major downtime.

Enhanced energy efficiency contributes to lower operational costs and improved PUE. In summary, modern data center air ducts, particularly fabric-based systems, provide precise, flexible, and energy-efficient airflow management, ensuring optimal cooling for high-density server environments while allowing for future scalability and reduced operational costs.

Data Center Server Room Air Ducts - ROGER FIBRE ATELIER [PDF]

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