In the 2026 Malaysian engineering landscape, SMACNA Duct Leakage Testing (DLT)—often referred to as Duct Air Leakage Testing (DALT)—is a statutory cornerstone for building handover. Under the Energy Efficiency and Conservation Act (EECA) 2024, which saw full enforcement begin in January 2026, duct leakage is no longer just a "performance issue"; it is a legal liability. Every liter of air that leaks into a ceiling void is unconditioned energy waste that directly inflates your Building Energy Intensity (BEI).
At EKG (Malaysia) SDN BHD, our DLT protocols utilize the latest SMACNA HVAC Air Duct Leakage Test Manual standards to ensure your "Duct Highway" is hermetically sealed and audit-proof.
As of 2026, the Suruhanjaya Tenaga (ST) and Registered Energy Auditors (REA) prioritize duct integrity as the primary physical strategy for achieving mandatory energy labels.
Airtightness Class 6 (ATC 6): In Kuala Lumpur and Selangor, Grade-A office developments now target ATC 6 (Leakage Class 6). This is the verified benchmark for SMACNA Seal Class A installations.
Specific Fan Power (SFP): Excessive leakage forces the VFD-driven AHU to ramp up to compensate for lost air, causing the SFP to exceed the statutory 1.6 kW/m³/s limit.
GITA Compliance: Documented DLT pass results are a technical requirement for claiming the 100% Green Investment Tax Allowance (GITA) on high-performance HVAC systems.
The intensity of the leakage test is determined by the Seal Class specified during the design phase. Under 2026 standards, Seal Class A is the baseline for all high-pressure and critical-supply ductwork.
| Seal Class | Sealing Requirements | Expected Leakage Class (CL) |
| Class A | All joints, seams, and wall penetrations. | CL 6 (Rectangular) / CL 3 (Round) |
| Class B | All transverse joints and longitudinal seams. | CL 12 (Rectangular) / CL 6 (Round) |
| Class C | Transverse joints only. | CL 24 (Rectangular) / CL 12 (Round) |
We utilize specialized DALT testing rigs (calibrated fan, orifice tube, and digital manometer) to perform pressurized "Static Tests" on completed duct sections.
Section Selection: Per SMACNA guidelines, we test no less than 25% of the total installed duct area for high-pressure systems (>750 Pa).
The Leakage Formula: We verify compliance using the SMACNA leakage equation:
(Where
Smoke Injection (Optional): For sections that fail the initial pressure test, we utilize non-toxic theatrical smoke to visually pinpoint leaks at hard-to-reach joints or Zero-Leakage Snap-Lock Duct Collars.
The DLT process must interface with BOMBA (JBPM) 2026 fire safety codes, specifically concerning Motorized Fire Dampers (MFDs).
Damper Seal Integrity: We verify that the interface between the MFD and the ductwork is sealed to Seal Class A standards. Leakage at the fire barrier is a major cause of smoke-spread during a fire event.
Automatic Fire Signal AHU Shut-off: We verify that the ductwork is robust enough to handle the sudden "Static Spike" that occurs when the AHU initiated an emergency shutdown and dampers close simultaneously.
BOMBA Audit: JBPM officers witness the mechanical security of the duct supports and fire seals during the annual Fire Certificate (FC) audit.
Technical Integrity: We are specialized T&C contractors, not fabricators. We provide an objective, third-party validation of your ductwork’s airtightness.
Audit-Ready Reporting: Our reports are generated using SMACNA-compliant templates, including surface area calculations and pressure-leakage curves, ready for your Registered Energy Manager (REM).
BEI Optimization: By eliminating "Ceiling Void Cooling" through leaks, we help you achieve the lowest possible Building Energy Intensity (BEI) score.
Is your "Duct Highway" leaking energy and money into the ceiling?
Contact EKG (Malaysia) SDN BHD today for professional SMACNA Duct Leakage Testing (DLT) & Statutory Compliance Audits.
Would you like to schedule a 10% preliminary leakage test to identify workmanship issues before the full system is enclosed?
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