In the 2026 Malaysian engineering sector, the AHU Outlet Fitting is a critical aerodynamic transition that connects the high-velocity discharge of the Air Handling Unit to the main supply ductwork. Governed by MS 1525:2024 and the Energy Efficiency and Conservation Act (EECA) 2024, this fitting is the primary point where "System Effect" losses occur. A poorly designed outlet fitting can increase static pressure by as much as 30%, forcing the VFD to run at higher frequencies and violating statutory Specific Fan Power (SFP) limits.
At EKG (Malaysia) SDN BHD, our outlet fittings are engineered to be Sterile, Silent, and Statutory-Compliant, ensuring the most efficient energy transfer from the fan to the building.
When air leaves the fan discharge, it is highly turbulent and has a non-uniform velocity profile. If the outlet fitting is too abrupt, the air cannot "settle," leading to massive pressure drops.
Discharge Velocity Profile: The air is typically faster at the top or bottom of the fan outlet. The fitting must allow for a "Straight Run" of ductwork—ideally 2.5 to 3.0 duct diameters—before the first elbow to allow the velocity profile to equalize.
Expansion Angles: To minimize energy loss, any transition (enlarging or contracting) must have a slope of no more than 15 to 30 degrees. Abrupt 90-degree transitions are categorized as "Energy Waste" under EECA 2024 audits.
Under the 2026 enforcement rules, every AHU must meet the 1.6 kW/m³/s SFP limit. The outlet fitting is a major factor in this calculation.
| Fitting Type | Pressure Drop (Typical) | Impact on BEI Rating |
| Abrupt Transition | 45 - 60 Pa | High; likely to push the building into a lower Star rating. |
| Radius-Guided Fitting | 10 - 15 Pa | Low; contributes to a 4-star or 5-star Building Energy Intensity rating. |
| Vane-Integrated Transition | 15 - 20 Pa | Moderate; a compliant solution for tight plant rooms. |
A professional EKG installation utilizes a coordinated assembly at the AHU discharge:
Flexible Connection: A double-flanged, fire-rated flexible connector is mandatory. It prevents the fan's mechanical vibration from being transmitted into the ductwork, ensuring the facility meets NC 30-35 acoustic standards.
Transformation Piece: A customized "tapered" fitting that matches the square/rectangular fan discharge to the main supply duct size.
Acoustic Lining: The first 3 to 5 meters of the outlet ductwork are typically internally lined with 50mm acoustic media to absorb the "Blast Noise" directly from the fan blades.
Static Pressure Sensor: The VFD Integrated Static Pressure Transducer is often located just after the outlet fitting to provide the primary feedback loop for the VFD speed control.
The outlet fitting must maintain structural integrity during an emergency under BOMBA (JBPM) 2026 regulations.
Motorized Fire Damper (MFD): Usually located immediately after the AHU outlet fitting if the unit serves a different fire compartment.
Automatic Fire Signal AHU Shut-off: Upon smoke detection, the MFD closes. The outlet fitting must be fabricated from heavy-gauge galvanized steel (G20 or G18) to withstand the momentary pressure spike before the VFD initiates a full stop.
BOMBA Audit: JBPM officers verify the "Fire-Rated Seal" at the point where the outlet fitting penetrates the plant room wall.
Technical Integrity: Our outlet fittings are designed using Computational Fluid Dynamics (CFD) principles to ensure the lowest possible resistance for your VFD.
Acoustic Excellence: We specialize in "Discharge Plenums" that kill fan noise at the source, preventing it from traveling through the duct "highway."
EECA Compliance Support: We provide the System Effect Analysis required by your Registered Energy Manager (REM) to prove that the AHU installation is optimized for the lowest energy footprint.
Is your AHU fighting high static pressure at the discharge point? Contact EKG (Malaysia) SDN BHD today for a specialized Outlet Aerodynamic & Statutory Compliance Audit.
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