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HEPA Filter Integrity Testing (PAO Testing) | 2026 Certification by EKG (Malaysia) Sdn Bhd

In the 2026 Malaysian regulatory landscape, HEPA Filter Integrity Testing, commonly known as PAO (Polyalphaolefin) Testing, is the definitive mandatory requirement for compliance with ISO 14644-3 and the DOSH ICOP IAQ 2026. Because a single pinhole leak or a faulty frame seal can bypass the entire filtration system, on-site "Scan Testing" is the only way to certify that your cleanroom or sterile suite is truly protected.

At EKG M&E, we leverage 34 years of engineering depth to provide NIST-traceable integrity testing that satisfies NPRA, FDA, and DOSH audits.

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1. The Science of the Aerosol Challenge

Integrity testing is not a particle count; it is a "stress test" of the filter media and its seals using a controlled challenge aerosol.

• PAO Aerosol Generation: We inject a polydisperse aerosol of Polyalphaolefin (PAO)—a safe, non-toxic, and non-carcinogenic oil—upstream of the HEPA filter. The aerosol is generated to a specific concentration (typically $ 10 to100 micrograms per liter).

• Upstream Concentration (100): We measure the "Challenge" concentration before it hits the filter. This establishes the baseline for the "Zero Leak" calculation.

• Downstream Scanning: Using a calibrated Aerosol Photometer, our technicians scan 100% of the filter face and the entire perimeter of the gasket or gel-seal.

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2. Failure Criteria & The 2026 "Zero-Bypass" Standard

To pass a 2026 ISO 14644-3 audit in Malaysia, the filter must meet strict penetration limits:

• Acceptance Limit (0.01\%): Any localized penetration exceeding 0.01% of the upstream concentration is considered a "Significant Leak" and a failure.

• Pinholding vs. Seal Leaks: Most failures occur at the Gasket/Gel-Seal interface rather than the media itself. Our testing identifies exactly where the bypass is occurring—whether it's a "Media Tear," "Frame Joint Leak," or "Gasket Compression Failure."

• Bleed-Through vs. Leaks: We distinguish between natural "Bleed-Through" (uniform low-level penetration) and a "Leak" (a sharp, localized spike), ensuring your H14 filters are performing at their rated 99.995% efficiency.

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3. VFD Optimization & The Cube Law

Integrity testing is intrinsically linked to your Variable Frequency Drive (VFD) and overall system health under the Energy Efficiency and Conservation Act (EECA):

• Velocity Calibration: To get an accurate PAO reading, the airflow must be at the design velocity (typically 0.45 m/s). We use the VFD to "lock" the fan speed during the test to prevent pressure fluctuations from skewing the results.

• The Cube Law Advantage: By identifying leaks early, we prevent the "Fan Over-Work" phenomenon. Following the Cube Law, if a leak causes the system to lose pressure, the VFD might ramp up unnecessarily. A sealed, high-integrity system allows the VFD to run at a 20% lower speed, slashing ventilation power draw by nearly 50%.

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4. Mechanical Health: FFT Vibration Analysis

To ensure that new leaks don't develop immediately after testing, we employ Fast Fourier Transform (FFT) Analysis:

• Resonance Fingerprinting: We monitor the vibration signature of the filter housing. If the AHU fan motor creates a harmonic resonance that causes the filter media to "flutter," it can lead to micro-tears in the delicate glass-fiber.

• VFD Frequency Skipping: If a resonance is detected, we program the VFD to "skip" that specific RPM range, preserving the integrity of your 18-month filter lifecycle and ensuring the PAO certification remains valid until the next audit.

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Why Trust EKG M&E for PAO Testing?

• 34 Years of Engineering Depth: A Malaysian leader in high-performance MEP for semiconductor, pharmaceutical, and healthcare sectors.

• Audit-Ready Certification: We provide a comprehensive Filter Integrity Report, including "Leak Maps" and "Photometer Calibration Certificates," essential for DOSH 2026 compliance.

• Turnkey Repair: If a leak is found, we don't just report it; we offer Certified Patching or Filter Replacement and re-testing in a single site visit.