In a data centre with a raised floor, the space beneath the tiles (the plenum) acts as a high-pressure reservoir for chilled air. Underfloor Air Pressure Balancing is the engineering process of ensuring that this pressure is uniform across the entire room. Without proper balancing, "Air Starvation" occurs at the end of server rows, while "Air Turbulence" or "Bypass Air" wastes energy near the cooling units.
EKG M&E Sdn Bhd utilizes advanced airflow modeling and Variable Frequency Drive (VFD) synchronization to optimize plenum pressure, directly improving your PUE (Power Usage Effectiveness).
To deliver air effectively, the plenum must maintain a positive static pressure relative to the room above.
Static Pressure ($\Delta P$): Typically maintained between 12.5 Pa to 25 Pa (0.05 to 0.10 inches of water column).
The Bernoulli Effect: If air moves too fast near the CRAC unit (high velocity), the static pressure actually drops at that point. This can cause a "Venturi Effect" where cold air is sucked back into the floor instead of blowing out of the tiles.
In 2026, manual balancing is obsolete. We utilize Variable Frequency Drives (VFDs) on the CRAC/CRAH blower motors to automate pressure management:
Sensor Placement: We install differential pressure sensors at the "Remote Nodes"—the points furthest from the cooling units.
Dynamic Response: The VFDs modulate the fan speed in real-time. If an IT manager opens a floor tile for maintenance, the pressure drops; the VFD instantly ramps up the fans to compensate and maintain the "Cold Aisle" curtain.
Energy Savings: Running fans at 80% speed via a VFD uses significantly less power than running at 100% with mechanical dampers, thanks to the Affinity Laws of fluid dynamics.
As an HVAC and Clean Air Specialist in Kuala Lumpur, we employ several physical interventions to balance the floor:
| Intervention | Technical Function | EKG M&E Implementation |
| High-Flow Perforated Tiles | Reduces resistance for high-density racks. | Strategically placed in "Hot Spot" zones only. |
| Underfloor Baffles | Directs air around corners or obstructions. | Prevents "dead zones" behind large cable trays. |
| Plenum Dividers | Separates the floor into zones. | Used in large facilities to prevent "cross-talk" between CRACs. |
| Brush Grommets | Seals cable cutouts. | Eliminates "Bypass Air" that leaks into the Hot Aisle. |
Airflow is invisible, so we use precision instruments to "see" the pressure distribution:
Digital Manometer Testing: We map the static pressure at every tile location to identify "low-pressure" zones.
Vibration Spectrum Analysis: We perform FFT analysis on the floor-mounted cooling fans. Unbalanced pressure can lead to "fan surging," which causes mechanical vibration that resonates through the floor grid and affects server HDDs.
Thermal Heat Mapping: We use infrared cameras to correlate underfloor pressure with rack intake temperatures, ensuring no server is "breathing" its own hot exhaust.
34-Year Legacy in KL: We have optimized the airflow for Malaysia's leading financial and telecommunications hubs, where rack densities are constantly changing.
Turnkey MEP Capability: We manage the Raised Floor Construction, the VFD Electrical Programming, and the BMS Integration as one cohesive project.
PUE Optimization: Our balancing service typically reduces cooling energy costs by 15% to 25% by allowing you to raise the Chilled Water setpoint.
Malaysia
