In the 2026 Malaysian HVAC landscape, the Low-Resistance AHU Plenum Box is the primary aerodynamic interface used to equalize air pressure and velocity before air is distributed into the main duct "highway." Governed by MS 1525:2024 and the Energy Efficiency and Conservation Act (EECA) 2024, an optimized plenum design is critical for achieving the statutory Specific Fan Power (SFP) limit of 1.6 kW/m³/s.
At EKG (Malaysia) SDN BHD, we engineer plenum boxes to be Sterile, Silent, and Statutory-Compliant, ensuring that your VFD-driven AHU operates with minimal "System Effect" losses.
A plenum box acts as a "buffer zone" where the high-velocity, turbulent air leaving the AHU fan is allowed to slow down and expand. This process converts Velocity Pressure into Static Pressure, ensuring a uniform flow across all duct outlets.
Aspect Ratio Optimization: We design plenum boxes with an internal volume that allows the air velocity to drop to under 5.0 m/s. This prevents "Air Hammering" against the plenum walls, which can cause structural vibration and noise.
Expansion Angle: Any transition from the AHU outlet to the plenum follows a maximum slope of 15° to 30°. Abrupt expansions create "Dead Air" eddies that spike the External Static Pressure (ESP) and inflate energy bills.
Under the 2026 enforcement rules, the plenum box is a primary target for energy audits by Registered Energy Auditors (REA).
| Design Metric | Statutory Requirement | EKG Implementation |
| Specific Fan Power | < 1.6 kW/m³/s | Low-resistance internal geometry reduces the kW load on the VFD motor. |
| Air Leakage | SMACNA Seal Class A | All seams are double-sealed to prevent "Energy Waste" into the plant room. |
| Energy Intensity | BEI Target Tracking | Efficient static regain allows the fan to run at a lower, energy-saving RPM. |
| Tax Incentives | GITA 2026 | Eligible for 100% Green Investment Tax Allowance as part of a high-efficiency setup. |
A professional EKG plenum design utilizes a multi-layered approach to airflow management:
Acoustic Sound-Attenuated Lining: The plenum is internally lined with 50mm antimicrobial acoustic media. This absorbs the direct "Blast Noise" from the AHU fan blades, helping the facility meet NC 30-35 acoustic targets.
Internal Turning Vanes: In multi-outlet plenums, we install aerofoil turning vanes. These "slice" the air and guide it smoothly into each branch duct, preventing the pressure spikes associated with turbulent air collisions.
VFD Integrated Static Pressure Transducer: The sensing probe is often located within the plenum or just downstream to provide the stable feedback signal required for the VFD's PID loop.
The plenum box must maintain structural and fire integrity under BOMBA (JBPM) 2026 regulations.
Heavy-Gauge Fabrication: Plenums are fabricated from G20 or G18 galvanized steel to ensure they do not collapse or deform during the high-pressure surges of a "Smoke Spill" event.
Motorized Fire Damper (MFD) Integration: MFDs are typically installed at the exit points of the plenum if it penetrates a fire-rated plant room wall.
Automatic Fire Signal AHU Shut-off: Upon a fire signal, the VFD initiates a full stop. The plenum is designed to withstand the momentary back-pressure without compromise to its airtight seal.
Technical Integrity: Our plenum designs are led by mechanical specialists who use Computational Fluid Dynamics (CFD) principles to eliminate "hot spots" and pressure drops.
Acoustic Excellence: We specialize in "Discharge Plenums" that kill fan noise at the source, preventing it from traveling through the ductwork.
EECA Compliance Support: We provide the "Pressure Drop Verification" reports required by your Registered Energy Manager (REM) for mandatory statutory energy submissions.
Is your AHU struggling with high discharge pressure or excessive noise?
Contact EKG (Malaysia) SDN BHD today for a specialized Plenum Aerodynamic & Statutory Compliance Audit.
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