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What are the different types of fan filter units?

Author:Jason Peng
Cleanroom Engineering Technology Manager of Deiiang Company.

Product R&D Manager of GDC Inc. Cleanroom Equipment Manufacturing Company.

Executive Director of Guangdong Cleanroom Industry Association of China.

Engaged in R&D of related products for 15 years, with rich relevant technical experience
2025-02-10 | Visits:

Fan Filter Units (FFUs): Comprehensive Guide

Essential components for cleanroom and controlled environment applications

What are Fan Filter Units?

Fan filter units (FFUs) are critical components in cleanroom and controlled environment applications, providing both filtration and airflow. They come in various types, each designed to meet specific requirements based on application, airflow needs, and filtration efficiency.

Types of Fan Filter Units

1. hepa FFUs

Designed to filter out 99.97% of particles that are 0.3 microns in size or larger.

Applications: Pharmaceutical, biotechnology, and Semiconductor manufacturing cleanrooms.

2. ULPA FFUs

Capable of filtering out 99.999% of particles that are 0.12 microns and larger.

Applications: Medical and research labs requiring highest cleanliness levels.

3. Pre-Filter FFUs

Include a pre-filter stage that captures larger particles before they reach the main filter.

Benefits: Extends main filter life and improves overall efficiency.

4. Fan Filter Modules (FFMs)

Compact version that integrates a fan with a filter in a modular form.

Applications: Smaller cleanroom applications or localized areas.

5. Recirculating FFUs

Recirculate the air within a space, filtering and redistributing it.

Applications: Environments where continuous air cleaning is necessary.

6. Static FFUs

Non-dynamic units that rely on natural airflow without a fan.

Applications: Specialized applications where low airflow is sufficient.

FFU Airflow Modes

Mode	Description	Applications
Downflow	Delivers filtered air vertically downward, creating laminar airflow	Cleanrooms where uniform cleanliness is critical
horizontal flow	Distributes Clean air parallel to the floor	Laboratories and manufacturing areas
Recirculating	Filters and redistributes air within a space	Environments needing continuous air cleaning

Filtration Efficiency

hepa filters

Capture 99.97% of particles 0.3 microns and larger

ULPA Filters

Achieve up to 99.999% efficiency for 0.12-micron particles

Note: Regular monitoring and replacement of filters are essential to maintain efficiency levels and prevent contamination.

Pollutants Removed by FFUs

Dust and Particulates: Captures airborne dust, fibers, and particulate matter
Microorganisms: Filters out bacteria, viruses, and fungi
Chemical Fumes: Adsorbs VOCs and other harmful gases
Allergens: Removes pollen, mold spores, and pet dander
Smoke and Odors: Filters out smoke particles and unpleasant odors
Static Charges: Some units can help reduce static electricity