Working Principle and Classification of FFU Fan Filter Unit

In modern cleanroom environments, in order to ensure that the air cleanliness in the space meets strict standards, Fan Filter Unit (FFU) has become one of the indispensable equipment. Whether it is a semiconductor, pharmaceutical, biomedical or food workshop, FFU can continuously deliver clean air after high-efficiency filtration to the clean room. This article is mainly about the working principle and common classification of Fan Filter Unit.

Definition of Fan Filter Unit (FFU)

Fan Filter Unit is an air purification device with built-in fan and high-efficiency filter (HEPA or ULPA). It is usually installed in the ceiling of the clean room, directly sucking in indoor air from above, and evenly sending clean air into the room after filtering, forming a unidirectional flow or laminar flow environment.

In places with high requirements for air cleanliness, such as electronic dust-free workshops or pharmaceutical cleanrooms, HEPA Fan Filter Unit is often used, which can effectively filter ≥99.99% @0.3μm particles to ensure that the indoor air is in a high clean state for a long time.

Working principle of Fan Filter Unit

The operation process of FFU is actually very clear and simple, but the effect is extremely stable and efficient:

• Air intake: The fan draws air from the ceiling into the device.

• High-efficiency filtration: The air passes through the built-in HEPA or ULPA filter to effectively trap dust, particles and microorganisms.

• Clean air supply: The purified air is evenly delivered into the clean room to form a vertical or horizontal airflow to continuously maintain the cleanliness of the environment.

Common classification of Fan Filter Unit

According to the structural form, fan type and usage scenario, FFU can be mainly divided into the following categories:

• Standard Fan Filter Unit: Suitable for most ordinary clean room environments.

• HEPA Fan Filter Unit: Equipped with high-efficiency HEPA filter, suitable for workshops with higher requirements for air cleanliness.

• EC Fan Filter Unit: Adopts energy-saving DC brushless motor, energy saving and noise reduction, and longer service life.

• Ultra-thin Fan Filter Unit: Suitable for clean areas with limited floor height and compact space.

• Variable speed FFU: The wind speed can be flexibly adjusted according to the indoor cleanliness requirements, which is convenient for management.

In different application scenarios, the selected FFU models also have different focuses. For example, Fan Filter Unit for Clean Room clean workshops usually give priority to EC energy-saving silent FFU, while in biopharmaceutical clean workshops, HEPA-grade FFU is preferred to ensure that bacterial particles in the indoor air are thoroughly filtered.

Summary

Whether it is a HEPA Fan Filter Unit or an energy-saving EC FFU, a reasonable selection can truly ensure that the workshop environment reaches the required cleanliness level.