When FFU and high-efficiency air supply vents are mixed, how should I choose the filter?

First determine the filtration efficiency according to the cleanliness requirements of the respective areas responsible for the two types of terminals, and then check the filter resistance separately: FFU depends on the fan operating point of the complete machine at the target air volume, and the efficient air supply outlet depends on whether the upstream air supply system can overcome the resistance of the air duct and terminals. Finally, confirm the sealing, testing and replacement conditions of the filters and their respective boxes.

Using both FFU and high-efficiency air supply outlets in the same clean room does not mean that the same type of filters must be installed at all ends. The selection should be based on the process requirements and air supply system capabilities of each location, rather than the name of the terminal equipment.

The same filtering level may also require different structures

Filtration efficiency should be determined based on cleanliness goals, particle control requirements and testing requirements. FFU and high-efficiency air supply vents can use the same efficiency levelHEPA or ULPA filter , but the overall dimensions, frame and sealing method of the filter must still be adapted to the end box respectively.

If a local process area requires a higher filtration level, the requirements should be clearly defined for this area, and the airflow organization of adjacent areas should be checked at the same time. Simply improving the filtration efficiency at a certain end cannot replace air volume distribution and on-site cleanliness verification.

The resistance data should be viewed under the same design air volume.

When comparing filters, you should request initial resistance data indicating the test air volume and understand the operation and maintenance conditions agreed upon by the project. After changing to a higher resistance filter,FFU may need to adjust the operating gear; high-efficiency air supply vents may affect the air supply volume of the corresponding branch.

Therefore, even if the same level of filters is used at both ends, the same 'allowable pressure difference' judgment standard cannot be directly applied. It should be determined based on the FFU fan capacity, the capacity of the upstream air supply system and the target air volume in each area.

Three things to verify before delivery

After the filter is determined, the project should verify the testing requirements of the filter itself, the seal after installation at the end, and the air supply volume under actual operating conditions. In rooms where FFU and high-efficiency air supply outlets are mixed, the air volume distribution, airflow distribution and cleanliness between the two types of terminals should also be checked to avoid that the respective data is qualified but the on-site effect does not meet the design.

Aili Industrial can match the filter and FFU complete machine based on the cleanliness requirements, target air volume, installation size and control method of the area FFU is responsible for. During technical communication, it is recommended to provide plane and ceiling diagrams indicating the locations of the two types of terminals, filtration requirements for each area, target air volume and detection methods. The specific configuration is subject to the project technical agreement and on-site test results.

Can filters with the same efficiency rating be directly interchanged?
uncertain. It is also necessary to check the size, frame, sealing method, resistance under the design air volume and testing requirements.

After the FFU filter is upgraded, do the high-efficiency air supply vents also need to be upgraded simultaneously?
They should judge according to the process requirements of their respective areas of responsibility, and recheck the airflow distribution in the mixed area.

If the filter report is qualified, can the end be accepted?
The installation seal and actual air supply must also be checked and verified on-site as required by the project.