In 2026, Dynamic Insertion Loss (DIL) Testing is the gold standard for verifying the real-world acoustic performance of HVAC silencers. Unlike static tests, DIL measures the decibel reduction of an attenuator while air is actively flowing through the system. Under the Energy Efficiency and Conservation Act (EECA) 2024 and GBI standards, DIL data is critical because airflow significantly impacts a silencer’s ability to "trap" sound. For facilities in Kuala Lumpur and Selangor, DIL testing ensures that your infrastructure meets Noise Criteria (NC) targets under actual operating conditions.
At EKG M&E Sdn Bhd, we apply 34 years of mechanical engineering expertise to conduct and analyze DIL data. We ensure your sound attenuation strategy is effective and energy-efficient, supporting a 5-Star BEI.
The acoustic performance of a silencer is not a fixed value; it changes based on the velocity and direction of the air passing through it.
Airflow Interaction: As air velocity increases, the "effective" absorption of the acoustic media can decrease. DIL testing accounts for this by measuring attenuation at various face velocities (e.g., 5 m/s, 10 m/s, 15 m/s).
Forward vs. Reverse Flow: In supply air systems (forward flow), the sound and air travel in the same direction. In return air systems (reverse flow), they travel in opposite directions. DIL testing captures these differences, ensuring your AHU and FCU silencers are correctly specified for their specific role.
Lowering the BEI: DIL testing also measures Regenerated Noise—the sound created by the air itself as it passes through the silencer baffles. By selecting silencers with low regenerated noise, we prevent the attenuator from becoming a secondary noise source, allowing for lower fan speeds and a better Building Energy Index (BEI).
We follow the ASTM E477 or ISO 7235 standards to ensure the accuracy and repeatability of the acoustic data:
DIL is measured across the eight standard octave bands (63 Hz to 8000 Hz). This is essential because a silencer might perform exceptionally well at high frequencies (hiss) but fail to attenuate the low-frequency "thrum" of a large fan motor when under load.
We calculate the Insertion Loss (IL) at the system's design velocity. If the velocity is too high, the air can "strip" sound waves away from the absorbent baffles, reducing the IL. Our engineers use this data to ensure the silencer's "Free Area" is optimized for both sound and static pressure.
We measure the sound power level generated by the silencer itself when no external sound is present but air is flowing. If the self-noise exceeds the target NC level of the room, the silencer is deemed "acoustically transparent" or a failure, regardless of its insertion loss.
| Metric | Static IL Testing | EKG Dynamic (DIL) Testing |
| Airflow Consideration | None (Lab Only) | Simulated Design Velocity |
| Regenerated Noise | Not Measured | Accurately Captured |
| Flow Direction | Not Applicable | Forward & Reverse Flow Data |
| Real-World Reliability | Low (Estimation) | High (Field Verified) |
| EECA 2024 Status | Basic | Optimized for 5-Star BEI |
Meeting GBI and LEED Certification: For "Grade A" offices in KL, meeting strict acoustic targets is a prerequisite for high-tier green building ratings. DIL testing provides the empirical evidence required by auditors to prove the system performs as designed.
Lowering TNB Maximum Demand: By understanding the DIL, we can avoid over-sizing silencers. Over-sized silencers create unnecessary static pressure, forcing fans to work harder. Precise DIL data allows for the most "aerodynamically transparent" silencer choice, lowering your energy profile.
Bio-Security & IAQ (DOSH 2026): In high-velocity medical or lab environments, DIL testing ensures that the acoustic treatments do not fail under the high air-change rates required for sterile environments.
34 Years of Engineering Depth: Based in KL, we are mechanical contractors who understand the forensics of sound and air. we provide data-driven solutions that balance silence with energy performance.
Turnkey Safety & Quality: All DIL testing is conducted using calibrated instrumentation and follows MS 1472 mechanical standards, ensuring your infrastructure is safe and compliant.
Digital Twin Ready: We provide full DIL performance curves for every silencer in your system, which can be integrated into your building's 3D digital twin for real-time performance tracking and facility management.
Is your sound attenuation based on lab estimates or verified dynamic performance? Contact EKG M&E Sdn Bhd today for specialized Dynamic Insertion Loss (DIL) testing and secure the 5-star performance of your infrastructure.
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