Wiskind Fan Filter Unit for Clean Room

Wiskind Cleanroom Fan Filter Units（FFU） FAQs

• What is the function of a cleanroom fan filter unit?

  A cleanroom fan filter, often called an FFU, is a self-contained, motorized system engineered to supply clean air in controlled settings such as cleanrooms. These units combine a fan with either a high-efficiency particulate air (HEPA) or ultra-low penetration air (ULPA) filter. Positioned in the plenum—the area above the cleanroom's ceiling—they pull air through the filter, delivering purified air to maintain a contamination-free environment essential for sensitive operations.

• How do HEPA and ULPA filters differ in a fan filter unit for clean room applications?

  Selecting between HEPA and ULPA filters for clean room fan filter units hinges on your cleanroom's requirements. HEPA filters, commonly used, capture 99.97% of particles at 0.3 micrometers, making them ideal for less rigorous settings like ISO 7 or ISO 8 cleanrooms. Conversely, ULPA filters, which are pricier, remove 99.99% of particles as small as 0.12 micrometers, suiting stricter environments like ISO 5 or above, often needed in industries such as pharmaceuticals or semiconductors. For general purposes, HEPA filters are adequate, but ULPA filters are critical for highly controlled spaces.

• How to choose fan filter units for cleanroom?

  Picking the right fan filter unit for clean room use requires a clear understanding of your cleanroom's specifications. The cleanroom's classification is a primary consideration—higher classes like ISO 5 need more air changes per hour (ACH), necessitating additional FFUs. The required ACH depends on the classification and specific processes, which may demand increased air circulation. Filter type is also key: HEPA filters suit most applications, while ULPA filters are better for stringent environments, ensuring compliance with the cleanroom's classification standards.