최근 회사 사건 Guangzhou Cleanroom Construction Co., Ltd. 인증서

In cleanroom and precision manufacturing environments, air quality directly impacts product quality and safety. A Fan Filter Unit (FFU) is a core component for maintaining clean air, and HEPA filtration efficiency is one of the most critical parameters for customers. So, what is the HEPA filtration efficiency of an FFU? This article provides a comprehensive explanation.

What Is an FFU?

A Fan Filter Unit (FFU) is a modular air purification device that combines a fan and a high-efficiency particulate air (HEPA) or ultra-low penetration air (ULPA) filter. It is designed to deliver uniform, laminar airflow to maintain ISO-classified cleanroom standards.

FFUs are commonly used in:

• Semiconductor and electronics manufacturing
• Pharmaceutical and biotechnology industries
• Medical device production
• Food and beverage processing
• Aerospace, optics, and precision manufacturing

The Role of HEPA Filters in FFUs

The HEPA filter is the core component of an FFU, capable of efficiently removing airborne particles and contaminants. Key functions include:

• Particle Removal – Captures particles ≥0.3 μm with filtration efficiency of up to 99.99% or higher.
• Cross-Contamination Prevention – Ensures that the cleanroom air remains uncontaminated by dust, microbes, or other particles.
• Maintaining Cleanroom Standards – Works with airflow design to help maintain ISO Class 5–8 cleanroom environments.

What Is the HEPA Filtration Efficiency of an FFU?

Standard FFU HEPA filters typically achieve:

✅ Explanation:

The ≥0.3 μm size is the standard test particle size for HEPA filters, ensuring most airborne particles are efficiently removed.

For highly critical environments, such as semiconductor or microelectronics manufacturing, ULPA filters can be used for ultra-fine filtration.

Factors Affecting FFU HEPA Filtration Efficiency

Airflow Speed and Volume – Too high or too low airflow can reduce efficiency. Optimal FFU face velocity is typically 0.45 m/s ±20%.

Filter Quality – High-quality HEPA media with leak-proof design ensures consistent performance.

Installation Sealing – Proper FFU installation in ceilings or modular cleanroom structures prevents air bypass.

Maintenance and Replacement – Regular filter inspection and replacement are essential to maintain peak filtration efficiency.

How to Choose the Right FFU HEPA Filter

Cleanroom Class Requirements – ISO 5–8 cleanrooms require different airflow rates and filtration efficiencies.

Application Needs – Semiconductor and pharmaceutical industries need higher precision filtration.

Energy Efficiency and Noise – Consider DC or energy-saving motors for lower power consumption and stable airflow.

Serviceability – Filters with easy replacement and pressure indicators simplify maintenance.

Conclusion

The HEPA filtration efficiency of an FFU is typically 99.99% or higher, capable of removing particles ≥0.3 μm and meeting the air purification requirements of most cleanrooms. Choosing the right FFU involves not only considering HEPA efficiency but also airflow, installation quality, and maintenance schedule. Properly selected and maintained FFUs ensure stable cleanroom environments, safeguarding both product quality and operational safety.