HEPA filter is a crucial component in FFU. So, what do you know about the HEPA filter? Let’s explore why it is the most essential part of an FFU with Vietnam Cleanroom Equipment.

What is HEPA Filter?

The HEPA filter, also known as a HEPA filter membrane, is a device that retains extremely small dust particles (HEPA stands for High Efficiency Particulate Air filter).
HEPA filter technology was developed by the United States Atomic Energy Commission in the 1940s. Its purpose was to create an effective method for filtering radioactive particles that cause pollution, preventing them from being released into the environment.
The HEPA filter is widely used in cleanroom because it directly generates clean air - an essential element for cleanroom environments.
HEPA Filter

In which devices is the HEPA Filter commonly used in cleanroom?

Any device designed to create a clean air environment requires a HEPA filter, and many such devices are used in cleanrooms. Common examples include FFU (Fan Filter Unit), HEPA Box, Pass Box, Air Shower, BFU... Additionally, other devices using HEPA filters include Dispensing Booth, Laminar Airflow Unit, BIBO (Bag In Bag Out) systems, and isolation cabinets.
The application of HEPA filters in cleanroom is extensive, as many devices rely on them. This interconnected system of equipment is essential to maintaining a cleanroom environment, highlighting the importance of HEPA filters.

Why does an FFU need a HEPA Filter?

An FFU is an air purifier used in cleanroom, and effective air filtration requires a high-quality filter. The FFU generates clean air for the cleanroom, creating a downward, stratified airflow. Before this airflow enters the cleanroom, it must first pass through a filter.
For FFUs, filters such as ULPA filters can be used in cleanrooms requiring extremely high cleanliness. However, most FFUs typically use HEPA filters.
In fact, the clean air produced by an FFU is due to the HEPA filter. The FFU uses a fan to draw in air, pushing it through the HEPA filter, which captures dust particles. The air that passes through the filter is purified, with approximately 99.99% of dirt removed.
HEPA filter with FFU

HEPA Filter filtration levels:

  • H10: Capable of filtering 95% of dust particles according to the EN1822 standard.
  • H11: Capable of filtering 98% of dust particles according to the EN1822 standard.
  • H12: Capable of filtering 99.97% of dust particles according to the EN1822 standard.
  • H13: Capable of filtering 99.99% of dust particles according to the EN1822 standard.
  • H14: Capable of filtering 99.999% of dust particles according to the EN1822 standard.
Typically, the HEPA filter used in FFUs is the H13 grade.

HEPA Filter Sizes for FFUs

The size of the HEPA filter for an FFU generally depends on the FFU’s dimensions. The two standard HEPA filter sizes for commonly used FFUs are 1170x570x70 mm (Length x Width x Height) and 570x570x70 mm (Length x Width x Height).
Tags: