For over 34 years, EKG M&E Sdn Bhd has pioneered mechanical solutions that balance human wellness with operational economy. In the high-density commercial landscape of Malaysia, running ventilation fans at 100% capacity in empty boardrooms or half-occupied offices is a massive energy drain.
Demand Controlled Ventilation (DCV) is the "smart" alternative—an automated system that adjusts the fresh air supply based on real-time occupancy and pollutant levels, ensuring your building only breathes as much as it needs to.
The "brain" of a DCV system lies in its sensor array. Because humans exhale CO2 at a predictable rate, we use carbon dioxide levels as a proxy for occupancy:
NDIR C02 Sensors: We install medical-grade, Non-Dispersive Infrared sensors in the "Breathing Zone" (1.2m to 1.8m high).
Pollutant Triggers: In 2026, we expand DCV logic to include PM2.5 and TVOC sensors. If the office undergoes a cleaning cycle or outdoor haze spikes, the system automatically adjusts the air exchange rate.
Target Thresholds: We program the system to maintain CO2 levels below 800 ppm, far exceeding the JKKP/DOSH ICOP IAQ 2026 baseline of 1,000 ppm.
A DCV system is only as effective as the motor driving it. At EKG M&E, we utilize Variable Frequency Drives (VFDs) to transform "fixed" fans into dynamic assets:
Real-Time Modulation: The BMS receives data from the CO2 sensors and signals the VFD to ramp the fan speed up or down.
The Cube Law Savings: This is where the ROI lives. Because fan power is proportional to the cube of its speed, reducing the fan speed by just 20% can cut your ventilation energy costs by nearly 50%.
Soft-Start Protection: VFDs eliminate the electrical "inrush" spikes that occur when starting large motors, protecting your building’s switchgear and extending the mechanical life of the fan belts and bearings.
In Malaysia’s tropical climate, "more fresh air" isn't always better if that air is humid. Our DCV logic includes:
| Parameter | DCV Action | Benefit |
| High CO2 / Low RH | Increase Fresh Air via VFD. | Oxygenates space; improves focus. |
| Low Occupancy | Reduce VFD speed to "Min. Hygiene." | Massive energy savings; reduces chiller load. |
| High Outdoor Haze | Close dampers; boost internal filtration. | Protects occupants from $PM_{2.5}$ infiltration. |
| Building Pressure | Maintain +5 to +12 Pa. | Prevents "hot air leaks" and mold growth. |
Continuously varying the speed of a large fan can lead to mechanical "Resonance"—frequencies where the fan vibrates excessively. EKG M&E prevents this through Fast Fourier Transform (FFT) Analysis:
Critical Speed Mapping: We identify the "resonant" RPMs for your specific fan assembly and program the VFD to "skip" those frequencies.
Predictive Maintenance: We monitor the vibration spectrum of the motor. If a bearing begins to fail due to the constant speed changes, our system alerts us months before a breakdown occurs.
34-Year MEP Heritage: We have the local expertise to integrate DCV into both new builds and complex "Live Office" retrofits.
Turnkey Engineering: We handle the Sensor Calibration, Electrical VFD Panels, BMS Programming, and Final Air Balancing.
Green Certification Support: DCV is one of the highest point-scoring strategies for GBI (Green Building Index), LEED, and MyHIJAU credits.
Malaysia
