In the 2026 regulatory environment defined by EECA 2024 and the latest MS 1525 standards, Specific Fan Power (SFP) has become the primary metric for AHU performance. SFP measures the electrical power required by a fan to move a given volume of air ($kW/m^3/s$). A low SFP optimized layout is essential to lower the Building Energy Intensity (BEI) and secure a 4-star or 5-star energy rating.
At EKG (Malaysia) SDN BHD, we engineer AHU layouts that target an SFP of < 1.1 $kW/m^3/s$, far exceeding the mandatory baseline requirements for Malaysian commercial and industrial facilities.
The most common cause of high SFP is the "System Effect"—turbulence caused by poor duct connections that force the fan to work harder than its laboratory rating.
The 5-Diameter Discharge Rule: To optimize SFP, we engineer a straight discharge run of at least 5 duct diameters before the first bend. This allows turbulent air to stabilize and convert velocity pressure into useful static pressure.
Laminar Flow Transitions: We utilize gradual expansion transitions with angles of $< 15^\circ$. Sharp duct "boots" or sudden offsets create high-pressure drops that instantly spike the SFP.
Legacy belt-driven fans are the enemy of SFP optimization due to mechanical friction and transmission losses.
Zero Transmission Loss: We utilize IE5-rated Electronically Commutated (EC) motors. By eliminating belts and pulleys, we remove the 5–12% energy "tax" found in traditional units.
Modular Fan Walls: A Fan Array allows the unit to operate at its Best Efficiency Point (BEP) across varying loads. Under part-load conditions (common in office settings), the SFP of an EC array remains significantly lower than a single large motor throttled by a VFD.
SFP is a calculation of total system resistance. By reducing the internal pressure drop ($\Delta P$) of the AHU casing, we lower the power requirement.
Low Face-Velocity (LFV) Coils: We size the AHU layout for a face velocity of < 2.0 m/s. This significantly reduces "drag" across the cooling coil and filters. While this may slightly increase the unit's footprint, the reduction in lifetime electrical cost is massive.
High-Surface-Area Filters: Utilizing "V-Bank" or deep-pleat filters in the layout increases the surface area, lowering the initial and final pressure drops that the fan must overcome.
| Metric | Standard AHU Layout | EKG SFP-Optimized Layout |
| SFP Performance | 1.8 – 2.5 $kW/m^3/s$ | < 1.1 $kW/m^3/s$ (Star-Rated) |
| Fan Technology | Belt-Driven AC (IE2/IE3) | Direct-Drive EC Array (IE5) |
| Airflow Profile | Turbulent (High $\Delta P$) | Laminar (Low $\Delta P$) |
| Casing Leakage | L3 Standard | L1 Precision Sealed |
| Internal Velocity | 2.5 – 3.0 m/s | < 2.0 m/s (Low Friction) |
Under the Energy Efficiency and Conservation Act 2024, SFP values must be verifiable for the Energy Commission (Suruhanjaya Tenaga).
3D BIM Coordination: We use BIM to model the "Golden Path" of the air. This ensures that electrical trays and structural beams do not force "last-minute" sharp bends that would ruin the SFP during site installation.
Real-Time SFP Monitoring: Our layouts include integrated pressure transducers and kWh meters. This allows the building’s Energy Management System (EnMS) to calculate and report real-time SFP, ensuring your facility stays compliant with its star-rating targets throughout 2026.
Technical Integrity: We provide the SFP and BEI impact reports required by Registered Energy Managers (REM) for statutory audits.
L1-Class Sealing: Our units are built to the highest airtightness standards, ensuring no "parasitic" energy loss through the casing.
BOMBA-Compliant Safety: All aerodynamic and acoustic materials used in our SFP-optimized layouts are fire-rated (Class 0 or B1).
Is your AHU's high SFP threatening your building's energy compliance? Contact EKG (Malaysia) SDN BHD today for a technical performance audit. We specialize in engineering infrastructure that is silent, maintainable, and ultra-efficient.
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