In the 2026 Malaysian M&E landscape, Duct Leakage Class ABCD Testing (based on the DW143 Standard) is the primary engineering method for certifying a building's energy efficiency. Under the EECA 2024, every HVAC system in Kuala Lumpur and Selangor must be classified and tested to ensure it doesn't leak expensive cooled air into ceiling voids.
At EKG M&E Sdn Bhd, we apply 34 years of mechanical engineering expertise to verify these classes, helping you achieve a 5-Star Energy Intensity Label.
The "Class" of a duct system is determined by its Design Operating Pressure. The higher the pressure, the more airtight the duct must be.
| Duct Class | Pressure Category | Max Static Pressure | Typical Application |
| Class A | Low Pressure | 500 Pa | Branch ducting, small office VAV outlets. |
| Class B | Medium Pressure | 1000 Pa | Main distribution headers in commercial buildings. |
| Class C | High Pressure | 2000 Pa | High-rise risers, Data Centers, and Grade-A towers. |
| Class D | Ultra-High Pressure | 2500 Pa | Specialized industrial labs and cleanroom systems. |
Per DW143, we calculate the "Leakage Factor" to determine if a system passes. While the math is complex, the goal is simple: ensure air loss ($L$) stays below the limit for your specific class.
Class A: The most "lenient," but still requires tight joints.
Class B: Must be 3 times tighter than Class A.
Class C: Must be 3 times tighter than Class B.
Class D: The gold standard, reserved for systems where zero-leakage is mission-critical.
At EKG M&E Sdn Bhd, we use a medical-grade protocol to verify your system's class:
Sectional Pressurization: We isolate the ductwork into zones. We then pump air in until we reach the Target Pressure for that class (e.g., 1000 Pa for Class B).
Steady-State Measurement: Using a calibrated PANDA tester, we measure how much "make-up air" is needed to hold that pressure. This is your actual leakage rate.
Forensic Smoke Testing: If a section fails its Class C or D test, we use Non-Toxic Smoke Generators. The smoke escaping from joints shows exactly where the seal has failed.
Certification: We provide the digital test sheets required for your building’s Registered Energy Manager (REM) and BOMBA audits.
EECA 2024 Compliance: You cannot claim a 5-star rating if your Class C riser is leaking like a Class A branch duct. Verification is a legal requirement for annual energy audits.
TNB Savings: Proper airtightness in High-Pressure (Class C) systems can reduce fan energy consumption by up to 30%.
DOSH 2026 Safety: High-pressure leaks can cause "Plenum Infiltration," sucking contaminants into your air. Class-verified testing ensures a sterile air path.
34 Years of Engineering Depth: We understand the physics of high-pressure plants. We ensure that testing pressures never damage your Smart Actuators or internal insulation.
Turnkey Documentation: We provide a single, audit-ready digital package containing robotic footage, calibrated test logs, and engineering certificates.
Total 3D BIM Coordination: We use 3D modeling to identify the best "Test Zones" for Class ABCD verification before your ceilings are closed.
Are your ducts in the right class for a 5-Star Energy Label? Contact EKG M&E Sdn Bhd today for professional Class ABCD duct leakage testing and secure your building's compliance.
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