WHAT IS A BFU? STRUCTURE AND OPERATING PRINCIPLE

2:29 24/04/2025 7 views

In the modern cleanroom industry, air filtration fan units play a key role in maintaining hygienic conditions and the production environment. Among these, the BFU (“Blower Filter Unit”) is an effective solution for controlled clean air supply. This article will provide you with a detailed overview of: What is a BFU? Structure and Operating Principle. The content promises to offer valuable information for businesses in the cleanroom industry.

What is a BFU?

BFU (Blower Filter Unit) is an integrated clean air supply unit that combines a blower and a HEPA/ULPA filter to clean and supply ultra-clean airflow to high-demand areas such as pharmaceuticals, electronics, and healthcare.

Key Features:

  • Compact integration, ceiling-mounted.
  • Operates independently or connected to HVAC.
  • Integrates HEPA or ULPA filters according to ISO 14644-1.

BFU Fan Structure

The BFU structure consists of multiple module-assembled components. Below are the main parts:

  1. Frame Housing:
  • Material: Powder-coated steel or 304 stainless steel.
  • Air-tight design to minimize leakage.
  1. Centrifugal Fan:
  • Generates airflow through the filter.
  • Can operate at variable speeds (EC fan).
  1. HEPA/ULPA Filter:
  • Filtration efficiency up to 99.999% for 0.3 µm particles.
  • Complies with ISO 14644-1 and EU GMP.
  1. Diffuser Panel:
  • Even air distribution.
  • Ensures stable airflow velocity at the discharge surface.
  1. Control Unit:
  • Can integrate features for speed control and filter replacement alerts.

Operating Principle of the BFU

The BFU operates on the principle of creating laminar or recirculated airflow, ensuring that filtered air does not mix with contaminated air.

Operating Steps:

  1. The centrifugal fan draws air from the plenum or HVAC system.
  2. The air is pushed through the HEPA/ULPA filter.
  3. Clean air is evenly distributed into the workspace.

Applications of BFU in the Cleanroom Industry

  • Pharmaceuticals: Create aseptic areas for compounding and filling.
  • Electronics: Chip assembly rooms, LCD manufacturing.
  • Food and Cosmetics: Create localized contamination-free zones.
  • Healthcare and Medical Devices: Use in operating rooms and sterilization areas.

BFUs are not limited to the pharmaceutical industry but are also widely used in production lines that require control of microorganisms, particulate matter, and volatile organic compounds (VOCs).

Benefits of Using BFU

  1. Improved Operational Efficiency
  • Airflow can be flexibly regulated.
  • Meets cleanliness levels from Class 100 to Class 100,000.
  1. Cost Optimization
  • Reduces dependence on central HVAC systems.
  • Easy to scale when upgrading localized areas.
  1. Easy Maintenance and Operation
  • Modular design.
  • Individual components can be replaced as needed.

GMP-Compliant BFU Installation Guide

  • Check ceiling gaps.
  • Mount the BFU onto the hanging frame.
  • Connect electrical power and ducting (if applicable).
  • Test airflow speed and pressure differential before operation.

Does the BFU Require Maintenance?

Yes. Some items require attention:

  • Check fan operation.
  • Replace filters periodically.
  • Clean the diffuser panel.
  • Verify pressure differential according to ISO 14644.

Considerations When Selecting a BFU on the Market

  1. Filter Quality
  • Prefer HEPA/ULPA filters that meet international standards (EN 1822, ISO 29463).
  1. Noise Level and Fan Performance
  • Check dBA ratings and capacity according to the application area.
  1. Integration Flexibility
  • Can be controlled independently or networked with a BMS (Building Management System).
  1. Origin and Certification
  • Prefer manufacturers with full CO/CQ documentation and factory particle testing certification.

Conclusion

The BFU is an effective, flexible clean air supply device that meets various cleanroom requirements. Understanding what a BFU is, its structure, and operating principle helps businesses optimize design, select the appropriate equipment, and achieve GMP/ISO 14644-1 compliance.

Contact us for precise and optimized cleanroom solutions.

Durate Vietnam Co., Ltd.
Hotline: 0971.722.247
Email: info@durate.com.vn
Website: Durate.com.vn
Factory: No. 22 Phuc Hau, Quan Am Hamlet, Bac Hong Commune, Dong Anh District, Hanoi

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