Since cleanroom facilities are designed with different levels of requirements depending on their usage, and some work environments require even higher cleanliness standards, FFU（Fan Filter Units） have thus been introduced. The emergence of FFU（Fan Filter Units） has effectively addressed this issue.Using FFU（Fan Filter Units） can effectively solve the problems present in cleanroom projects. The main points are as follows:
1.Space saving — Using FFU（Fan Filter Units）can save space and address the issue of limited maintenance space above the cleanroom ceiling.
High-standard cleanrooms often require Class 100 or even Class 10 laminar hoods to meet process requirements. In such cases, large supply air plenum boxes are installed above the cleanroom ceiling, with fans inside. These plenum boxes, along with supply and return air ducts, occupy significant space, reducing maintenance access and sometimes even affecting the use of fire escape routes.
When FFUs are used, the cleanroom ceiling can be divided into multiple modules, with each module being an FFU. By adjusting each module, the pressure balance requirements of the supply air plenum above the ceiling can be met, significantly reducing the height requirements of the plenum. Additionally, the need for large supply and return ducts can be eliminated, saving installation space. FFUs are particularly effective in renovation projects where ceiling height is limited. Moreover, FFUs come in various sizes and can be customized according to the actual dimensions of the cleanroom. Because of this, they occupy less vertical space within the supply air plenum, and essentially do not occupy space within the cleanroom itself, thereby further maximizing space savings.
2. FFU Flexibility—By utilizing the structural features of the FFU's independence, adjustments can be made at any time, compensating for the limited maneuverability of the cleanroom and thereby addressing the disadvantage of production processes that are not easily adjustable.
The maintenance structure of cleanroom facilities is generally made of metal panels, and once constructed, the layout cannot be freely altered. However, due to continuous updates in production processes, the original cleanroom layout may no longer meet the requirements of new processes, leading to frequent modifications in the cleanroom for product upgrades, which results in significant financial and material waste.By adjusting the number of FFUs, the cleanroom layout can be locally modified to accommodate process changes. Moreover, FFUs come with built-in power, air outlets, and lighting, which can save a substantial amount of investment. Achieving the same effect is nearly impossible for conventional integrated air supply purification systems.Because FFUs are self-powered, they are not limited by specific areas. In a large cleanroom, zoning control can be implemented as needed. Additionally, as semiconductor production processes evolve, the facility layout inevitably requires corresponding adjustments. The flexibility of FFUs makes such adjustments easy without necessitating additional investment.
3. Reducing Operational Burden — The FFU system is energy-saving, thereby addressing the drawbacks of central air supply, such as large air conditioning rooms and increased operating costs of air handling units.
If individual cleanrooms within a large-area cleanroom facility require a higher level of cleanliness, the air volume of a centrally supplied air conditioning unit must be large and the fan pressure high to overcome the resistance of ducts as well as the resistance of primary, medium, and high-efficiency filters, in order to meet the requirements. Moreover, in a central air supply system, any failure of an air conditioning unit will cause all cleanrooms associated with that unit to cease operation.Although the initial investment for using FFUs is higher than that for ducted ventilation, the system demonstrates outstanding energy-saving and maintenance-free characteristics during later operation, making FFUs more popular.
In air conditioning systems for cleanrooms and other high-cleanliness environments, fan filter units (FFUs) are one of the core devices for achieving air cleanliness control. FFUs ensure the purity and uniform distribution of indoor air through their efficient air filtration capabilities and stable airflow organization, and work together with dry coils (DCs) and other components to maintain the environmental conditions of cleanrooms.
High-efficiency air filtration and airflow organization
FFUs have built-in high-efficiency filters that can remove particles in the air, including dust, bacteria, and viruses, to ensure that the air delivered to the cleanroom meets high cleanliness standards.
At the same time, FFUs form stable vertical laminar or turbulent airflow organizations through the operation of their built-in fans to avoid local contamination. This stable airflow organization is essential for maintaining the cleanliness of cleanrooms, especially in the semiconductor manufacturing and biopharmaceutical fields where cleanliness requirements are extremely high.
Collaborative work and application scenarios
In dry coil systems, FFUs work together with dry coils (DCs) and other components (such as fresh air units MAUs). MAU is responsible for introducing and processing outdoor fresh air, removing particulate matter through primary and medium efficiency filtration, and processing the fresh air to the specified temperature and humidity.
The fresh air treated by MAU is mixed with part of the return air, filtered by FFU and sent to the clean room. After the indoor air is cooled or heated by the dry coil, it is circulated to the return air channel again and mixed with the supplementary fresh air to form a closed-loop air circulation system.
FFU runs continuously to maintain the number of air cycles and ensure the cleanliness of the indoor air; the dry coil adjusts the cold water flow or temperature according to the temperature sensor, and only processes the sensible heat load to avoid mutual interference in temperature and humidity control. This design with clear division of labor improves the overall performance and reliability of the system.
Among the many FFU products, KLC FFU is an excellent choice in the market with its excellent performance and flexible design. KLC FFU uses high-efficiency filters with KLC's exclusive technology, which can achieve high-efficiency air filtration and ensure high cleanliness of indoor air.
Its compact design is easy to install and maintain, and it has the characteristics of low noise and high energy efficiency, which can meet the requirements of different cleanliness levels.
KLC FFU also has flexible installation methods and intelligent control options, which can realize single-unit manual control or multi-unit group monitoring, and can adapt to the needs of clean room applications from small to large scale.
KLC FFU performs well in practical applications, especially in the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, providing users with efficient and reliable air purification solutions. Its efficient filtering performance and stable airflow organization ability can effectively prevent condensed water from contaminating wafers, ensure the sterile environment of drug production, and ensure the accuracy and stability of the equipment.
KLC FFU's low noise operation and high energy efficiency design also make it perform well in clean rooms with strict environmental requirements, providing users with an ideal air filtration option.
As the core air filtration equipment in the dry coil system, FFU provides a reliable solution for high-cleanliness environments such as clean rooms through its efficient filtering capacity and stable airflow organization. Its collaborative work with dry coils and other components further optimizes the performance and reliability of the system.
In the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, FFU has become a key equipment for maintaining a high-cleanliness environment to ensure the efficient and stable operation of the production process.
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