In a typical Kuala Lumpur office or retail mall, fans often run at 100 percent speed regardless of how many people are actually in the building. This results in "Over-Ventilation"—cooling massive amounts of hot, humid outside air for an empty room. A CO2 Based Demand Control Ventilation (DCV) Audit is the process of identifying how much energy you are wasting and how to automate your fans to breathe only when needed.
As part of a Ventilation Systems Audit, EKG performs this specialized study to link your indoor air quality directly to your fan's motor frequency.
Humans exhale Carbon Dioxide (CO2) at a predictable rate. By using CO2 as a "proxy" for occupancy, we can treat your building like a living lung:
The "Full House" Scenario: When meeting rooms are packed, CO2 rises. The audit determines the exact sensor setpoint needed to ramp up the fan to maintain 800 to 1000 ppm.
The "Empty Zone" Scenario: During lunch breaks or after-hours, CO2 levels drop. The audit calculates the "Minimum Ventilation" required to keep the building pressurized without wasting cooling energy.
The Health Barrier: We ensure that even at the lowest fan speeds, you are still meeting the 2026 DOSH (JKKP) minimum fresh air requirements.
We audit the entire "Command Chain" from the air in the room to the motor in the AHU:
CO2 Mapping and Data Logging: We place industrial-grade CO2 sensors in "High-Density" zones for 48 to 72 hours. This creates a "Daily CO2 Profile" that shows exactly when your building is over-ventilated.
Sensor Accuracy Calibration: Most "Wall Sensors" drift over time. We use NIST-calibrated handheld meters to verify if your current sensors are reading 400 ppm (fresh air) or 1200 ppm (stale air) correctly.
VFD Response Testing: We simulate high CO2 levels to see if your Variable Frequency Drive (VFD) actually reacts. We often find that the "Smart" logic is disabled, and the fan is stuck at a fixed 50Hz.
Outdoor Air (OA) Baseline: We measure the CO2 of the outside air. In high-traffic KL areas, "Fresh" air can already be at 500 ppm, which must be factored into the DCV logic.
DCV is the single most effective way to exploit the Cube Law for HVAC energy savings.
The Speed Advantage: Instead of running at 100 percent speed for 12 hours, DCV might allow the fan to run at 60 percent speed for 6 of those hours.
The Logic: Because of the Cube Law, a 20 percent reduction in fan speed results in a nearly 50 percent reduction in power consumption. A CO2 Audit proves exactly how many Ringgit you are "exhausting" into the street by over-cooling empty space.
| Occupancy Level | CO2 Reading (ppm) | VFD Speed Target | Air Quality Status |
| Empty (Night) | 400 to 500 | 20 to 30 Hz | Pressurization Mode |
| Low (Morning) | 500 to 700 | 35 to 40 Hz | Energy Saving Mode |
| Normal (Peak) | 800 to 1000 | 45 to 50 Hz | Standard Ventilation |
| Overcrowded | > 1100 | 50 Hz (Boost) | High-Priority Flush |
BMS and VFD Integration: We don't just give you a report. We work with your technicians to program the "PID Loops" in your drives, ensuring the transition between speeds is smooth and does not cause "Hunting" or mechanical stress.
Mechanical Fan Overhaul Support: If your fan is too loud or vibrates when ramping up, we perform a Dynamic Balance and Laser Alignment to ensure it can handle the variable speeds required by DCV.
Documented ROI: You receive a report showing the "Kilowatt-Hour" savings you will achieve by switching from Constant Volume to Demand Control.
Health and Safety Compliance: Our audits are designed to satisfy 2026 GBI (Green Building Index) and LEED requirements for "Indoor Environmental Quality."
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