In the 2026 Malaysian regulatory environment, Demand Controlled Ventilation (DCV) is a primary strategy for achieving the aggressive Building Energy Intensity (BEI) targets set by the Energy Efficiency and Conservation Act (EECA) 2024. Traditional AHUs operate at a constant volume, over-ventilating spaces during low occupancy and wasting significant fan and cooling energy. DCV transforms the AHU Box into an "intelligent" pressure vessel that modulates outdoor air intake based on real-time occupant density.
At EKG (Malaysia) SDN BHD, we integrate DCV as a structural and mechanical upgrade, ensuring your facility maintains DOSH (JKKP) 2026 air quality standards while hitting statutory energy benchmarks.
DCV utilizes sensor feedback—primarily $CO_2$ sensors—to adjust the AHU’s intake dampers and fan speeds. This prevents the unnecessary cooling of hot, humid Malaysian outside air when the building is under-occupied.
$CO_2$ Concentration Logic: Sensors placed in the return air duct or breathing zones signal the AHU to increase ventilation only when $CO_2$ levels approach the DOSH 2026 limit of 1,000 ppm.
IE5 EC Fan Wall Modulation: DCV works best when paired with an EC Fan Wall. Unlike legacy motors, EC fans maintain high efficiency even when dialed down to low RPMs, allowing the system to "coast" during low-occupancy periods (e.g., lunch hours or early mornings).
Neutralizing the Latent Load: By reducing outdoor air intake during low occupancy, we significantly reduce the amount of moisture entering the unit. This prevents "The Sponge Effect"—the saturation of internal insulation—and protects the structural integrity of the AHU Frame.
Implementing DCV is a recognized method for passing mandatory 2026 performance audits.
Specific Fan Power (SFP) Compliance: By modulating fan speed based on demand, your average SFP remains well below the statutory limit of 1.6 kW/m³/s.
DOSH 2026 (IAQ): While DCV saves energy, it must not compromise air health. Our systems include failsafes to ensure a "Base Ventilation" rate is always maintained to flush out Volatile Organic Compounds (VOCs), keeping microbial counts below 1000 CFU/m³.
BOMBA 2026: All motorized dampers and actuators integrated into the DCV retrofit are certified for fire-smoke safety, ensuring the unit remains a secure fire barrier.
We follow a forensic mechanical workflow to ensure your energy savings are both measurable and audit-ready.
| Stage | Engineering Action | Performance Outcome |
| I: Forensic IAQ Audit | Baseline $CO_2$, humidity, and occupancy mapping. | Establishes the data-driven "Demand Profile" for the building. |
| II: Mechanical Integration | Installation of motorized low-leak dampers and Ag+ liners. | Re-establishes the unit as a high-precision, sterile pressure vessel. |
| III: Sensor & VFD Logic | Placement of NDIR $CO_2$ sensors and EC Fan programming. | Enables dynamic, autonomous modulation of airflow and cooling. |
| IV: T&C Validation | Post-retrofit SFP verification and $CO_2$ response testing. | Provides the certified dossier required for your Registered Energy Manager (REM). |
To ensure the DCV system survives KL’s 90%+ humidity, we integrate automated sentinels to manage the latent load.
Automatic High-Level Float Switches: These trigger an override to the DCV logic if moisture levels rise in the tray, preventing accidental overflows that could lead to structural rot.
Precision Axial Sloping: We utilize laser-guided leveling to ensure a 1:50 slope. Even at lower airflow rates, condensate must be removed immediately to prevent "The White Slime" (bio-films) from forming in the tray.
Fiber-Free Closed-Cell Insulation: We replace legacy fiberglass with non-porous insulation. This ensures that when airflow is reduced during DCV operation, the casing remains a high-performance thermal barrier without "sweating."
Technical Integrity: We are mechanical and T&C specialists. We focus on the thermodynamic and structural stabilization of your assets through precision engineering.
Audit-Ready Reporting: Following every project, we provide an EECA 2024 Energy Performance & IAQ Report, essential for your annual building audits and ESG reporting.
GITA Sustainability: DCV retrofitting is a recognized "Green" intervention, qualifying for the 100% Green Investment Tax Allowance (GITA).
Is your AHU inventory currently wasting energy by over-ventilating empty spaces, or are you ready for an intelligent DCV upgrade?
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Malaysia
