In the 2026 Malaysian regulatory landscape, DW/143 (Guide to Good Practice: Ductwork Air Leakage Testing) has become the definitive benchmark for verifying HVAC system integrity. Following the enforcement of the Energy Efficiency and Conservation Act (EECA) 2024, this standard is no longer just a "best practice" for high-end projects—it is a critical tool for building owners in Kuala Lumpur and Selangor to validate their Building Energy Index (BEI) and ensure compliance with DOSH ICOP IAQ 2026.
Under DW/143, air leakage is not merely assumed; it is physically measured using calibrated equipment to ensure the "paid-for" cooling air reaches its intended destination.
The standard categorizes duct systems into four distinct classes based on their operating pressure and the tightness of their construction.
| Leakage Class | Typical Application | Max. Pressure (Pa) | Max. Leakage Rate (L/s⋅m2) |
| Class A (Low) | Local branch ducting | $500$ | $0.027 \times p^{0.65}$ |
| Class B (Medium) | Main distribution headers | $1000$ | $0.009 \times p^{0.65}$ |
| Class C (High) | Grade-A Offices / Data Centers | $2000$ | $0.003 \times p^{0.65}$ |
| Class D (Special) | Labs / Critical Industrial | $2500$ | $0.001 \times p^{0.65}$ |
Note: As of 2026, Class C is now the mandatory minimum for high-performance commercial buildings in Malaysia seeking a 4-Star or 5-Star Energy Intensity Label.
A compliant DW/143 test is a rigorous, three-stage diagnostic process performed by EKG M&E Sdn Bhd to certify system airtightness.
The ductwork is divided into manageable test zones. All terminal diffusers, branch take-offs, and openings are sealed using heavy-duty blanking plates or specialized high-pressure balloons.
Important: Components like fans, AHUs, and fire dampers are typically excluded from the duct test unless specified otherwise.
A calibrated Duct Leakage Tester (a high-precision fan with an integrated orifice plate) is connected to the isolated section.
The Test: The fan pressurizes the duct to its design operating pressure ($Pa$).
The Calculation: The amount of "make-up air" required to maintain that pressure is measured in liters per second ($L/s$). This value is then divided by the total internal surface area of the tested duct section ($m^2$).
If the measured leakage exceeds the allowable limit for the specified Class (A, B, or C), a failure is recorded.
Leak Detection: We utilize non-toxic smoke generators to visually pinpoint the exact joint or flange failure.
Remediation: Once leaks are sealed (often using Aerosolized Sealants for inaccessible areas), the test is repeated until a passing certificate is achieved.
EECA 2024 Audit Data: The Energy Commission (ST) requires empirical evidence of building efficiency. A DW/143 test report provides the "Digital Audit Trail" your Registered Energy Manager (REM) needs for mandatory annual energy submissions.
TNB Bill Reduction: In 2026, air leakage is a major driver of high Maximum Demand charges. Verifying your system to Class C standards can reduce fan energy consumption by 15% to 30%, as fans no longer have to over-work to compensate for "lost air."
DOSH ICOP IAQ 2026: Hermetic sealing (verified by DW/143) prevents the aspiration of dusty plenum air, ensuring you pass the mandatory 500 cfu/m³ bacterial ceiling for healthy workspaces.
Total 3D BIM Coordination: We model your test zones in 3D before arriving on-site, ensuring all "clash-points" and inaccessible joints are prioritized for testing.
Certified Digital Reporting: We provide an empirical tableau of your system's performance, including pre-test and post-test data, essential for building insurance and government compliance.
34 Years of Engineering Depth: Based in Kuala Lumpur, we specialize in the unique psychrometrics of the Malaysian climate, ensuring your seals and test results are permanent and reliable.
Does your current duct installation meet the 2026 airtightness mandates? Contact EKG M&E Sdn Bhd today for a professional DW/143 Standard Duct Leakage Test and secure the efficiency and health of your facility.
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