Air Change per Hour (ACH) is the gold standard for measuring how effectively a space is ventilated. In 2026, with higher standards for indoor air quality in Kuala Lumpur's office towers, hospitals, and cleanrooms, simply having a "spinning fan" is not enough. You must verify that the total volume of air in a room is being replaced at the frequency required by health and safety codes.
As part of a Ventilation Systems Audit, EKG performs precision ACH Verifications to ensure your building maintains the correct balance of hygiene and energy efficiency.
Many buildings operate on "Design Specs" that are decades old. Over time, mechanical wear reduces the actual air changes occurring in the space:
Infectious Disease Control: In clinical or high-density office settings, a drop from 6 ACH to 3 ACH doubles the time that airborne contaminants remain in the room.
CO2 and VOC Clearance: Low ACH leads to "Dead Zones" where carbon dioxide and odors linger, causing occupant fatigue and reduced productivity.
Compliance and Certification: For GBI (Green Building Index) or hospital accreditation, you must provide documented proof that your mechanical system meets specific ACH targets.
Over-Ventilation Waste: If your ACH is unnecessarily high (e.g., 15 ACH when 8 is required), you are wasting thousands of Ringgit cooling excess tropical air.
We don't guess based on fan speed; we measure the actual air movement within the occupied zone:
Volumetric Flow Measurement: We use calibrated Air Flow Hoods (Balometers) on every supply and extract grille to capture the exact cubic feet per minute (CFM) or cubic meters per hour (CMH).
Room Volume Calculation: We perform laser distance measurements of the room to calculate the exact internal volume, accounting for furniture displacement and ceiling voids.
Cross-Flow Analysis: We check for "Short-Circuiting," where air enters and leaves through a nearby vent without actually mixing with the air in the room.
VFD Synchronization: We correlate the ACH results with your Variable Frequency Drive (VFD) settings to find the exact motor frequency (Hz) needed to hit your target air changes.
ACH verification is a powerful tool for energy reduction. If an audit reveals you are over-ventilating, you can safely slow down the fan.
Speed Optimization: Reducing fan speed is the most effective way to lower electricity costs.
The Logic: Because of the Cube Law, a 20 percent reduction in fan speed results in a nearly 50 percent reduction in power consumption. By verifying your ACH, you gain the "Safety Data" needed to lower your VFD speeds confidently.
| Space Type | Typical Required ACH | EKG Audit Focus |
| Office Space | 4 to 6 | CO2 Clearance & Occupant Comfort |
| Kitchen / Cafe | 15 to 30 | Heat & Odor Extraction |
| Hospital Room | 6 to 12 | Pressure Gradients & Filtration |
| Server Room | 8 to 15 | Heat Load Dissipation |
| Car Park | 6 to 10 | Carbon Monoxide (CO) Removal |
NIST Calibrated Metrology: We use high-precision flow hoods and anemometers that are certified for accuracy, ensuring your audit stands up to regulatory scrutiny.
Mechanical Correction: If your ACH is low, we don't just "report it." We look at the Mechanical Fan Overhaul needs—checking for belt slip, dirty impellers, or leaking ductwork—to fix the root cause.
Pressure Gradient Mapping: We ensure that air flows from "Clean to Dirty" areas, preventing odors from the pantry or restrooms from entering the main workspace.
Comprehensive Digital Reports: You receive a room-by-room breakdown of air changes, complete with "Before and After" VFD tuning recommendations.
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