Duct traverse airflow measurement

Duct Traverse Airflow Measurement by EKG M&E Sdn Bhd

In 2026, Duct Traverse Airflow Measurement is the "Primary Standard" for quantifying HVAC performance in Malaysia. Unlike a single-point reading, which can be highly inaccurate due to turbulence, a traverse provides a mathematically averaged velocity profile of the entire duct. Under the Energy Efficiency and Conservation Act (EECA) 2024, this level of precision is mandatory for buildings in Kuala Lumpur and Selangor seeking to verify a 5-Star Energy Intensity Label.

At EKG M&E Sdn Bhd, we apply 34 years of mechanical engineering expertise to perform certified traverses, providing the "Physical Truth" your Registered Energy Manager (REM) needs for Suruhanjaya Tenaga (ST) audits.

1. The Engineering Logic of the Traverse

Air flowing through a duct does not move at a uniform speed; it is faster in the center and slower near the walls due to friction. Additionally, elbows, dampers, and transitions create "Turbulent Eddies."

• The Velocity Profile: A traverse involves taking multiple readings across a cross-section of the duct. This accounts for the high and low-velocity zones, ensuring the calculated total volume (L/s or CMH) is accurate.

• Optimizing the Fan Cube Law: Accurate measurement allows us to calibrate your Variable Frequency Drives (VFDs). If your "estimated" flow is off by 15%, your fan might be over-speeding, consuming 33% more energy than necessary.

• IAQ & Bio-Security (DOSH 2026): We use traverse data to verify that your system delivers the mandatory 10 l/s per person of fresh air, keeping your facility below the legal bacterial ceiling of 500 cfu/m3.

2. The EKG Traverse Protocol

We utilize medical-grade, calibrated instrumentation and follow the ASHRAE 111 and Log-Tchebycheff methodologies:

A. Selecting the Traverse Plane

We identify a section of "Straight Run" ductwork, ideally 7.5 duct diameters downstream and 3 diameters upstream from any obstruction. This ensures a stable, "Laminar" flow for the most accurate reading.

B. Multi-Point Grid Measurement

We drill small "Test Ports" into the duct and insert a Pitot tube or thermal anemometer. We take readings at specific grid points (e.g., a 16-point or 24-point grid) to capture the full velocity map.

C. Volumetric Calculation

We average the velocity (m/s) and multiply it by the duct's cross-sectional area (m2) to find the total airflow.

Total Flow = Average Velocity x Duct Area

3. Compliance Matrix: Audit-Ready Measurement Data

4. Why a Traverse is Essential for Your Asset

• Lowering TNB Maximum Demand: By proving the actual airflow, we can safely reduce fan speeds to their minimum required setpoints, flattening your energy profile.

• Eliminating "Ceiling Sweating": In KL’s 80%+ humidity, inaccurate airflow leads to localized condensation. A traverse identifies the "Dead Zones" where moisture accumulates, preventing mold and structural damage.

• BOMBA Fire Safety: We perform traverses on smoke spill and staircase pressurization ducts to ensure they meet the mandatory 50 Pa differential required for annual Fire Certificate (FC) renewal.

Why Choose EKG M&E Sdn Bhd?

• 34 Years of Engineering Depth: Based in Kuala Lumpur, we understand the specific aerodynamic challenges of high-rise "Stack Effect." We ensure our test ports are properly sealed with airtight gaskets after the audit.

• Turnkey Documentation: You receive a comprehensive digital "Airflow Certification" containing velocity maps, instrument calibration dates, and engineering sign-offs.

• BIM & Digital Twin Ready: We can update your 3D models with the final "As-Measured" airflow data, ensuring your digital assets match your building's physical performance.

Is your building's airflow being measured with precision or just estimated? Contact EKG M&E Sdn Bhd today for professional duct traverse airflow measurement and secure the 5-star efficiency of your building.