How should the FFU filter choose the filtering level?
Direct answer: FFU filter rating should be determined by the particle control objectives and acceptance requirements of the process area. First clarify the location that needs protection, the particle size of concern and the basis for filter efficiency testing, and then select the specific HEPA or ULPA grade. The filter resistance at the target air volume, the available static pressure of the FFU fan and the installed seals must then be checked. Clean room grades cannot directly and mechanically correspond to a certain filter grade.
Why can’t you just choose a filter based on cleanroom grade?
The clean room grade describes the control results of the particle concentration in the regional air; the filter grade describes the efficiency of the filter under specified test conditions. Regional cleanliness performance is also affected by dust generation from personnel and equipment, air supply volume, air flow organization, filter sealing and operating status.
Therefore, the filter configuration may need to be determined separately for the overall clean room, equipment-end micro-environment and local high-clean workstations in the same project. Selection should be based on process requirements rather than specifying a single filtration level for the entire workshop.
Determination order of filter levels
Select steps |
What needs to be written clearly |
1. Clarify the objects of protection |
Rooms, production lines, equipment interiors or specific workstations. |
2. Clarify granular goals |
Particle size of concern, area cleanliness requirements and testing status. |
3. Clarify the basis for efficiency |
The grade, detection method and efficiency judgment conditions adopted by the filter. |
4. Compare resistance |
The resistance of each candidate filter under the same target air volume. |
5. Check the whole machine |
FFU fan static pressure, actual air volume, sealing structure and maintenance methods. |
If the filter efficiency figures use different test particle sizes or methods, you cannot just look at the percentage. The filter grade and its testing basis should be indicated in the procurement or technical agreement to facilitate communication between supply, installation and acceptance parties using the same standard. Can be combinedAili Industrial HEPA/ULPA filter data determines candidate specifications.
After leveling up, what else should I check?
Higher filtration levels do not necessarily mean suitable for the project. Depending on the filter material, effective area and structure, the resistance will be different. If selectedFor ULPA filters or adjusting the original filtration level, the resistance should be compared under the same air volume and the FFU fan operating point should be rechecked.
In addition, the sealing of the filter and box, the leak detection arrangements after installation and the direction of subsequent replacement should be written into the project requirements. Even if the efficiency of the filter itself meets the requirements, installation gaps or insufficient on-site air supply may still affect the clean performance of the target area.
How does Aili Industry cooperate with filter grade customization?
Aili Industrial develops and produces motors, fans, control systems, sheet metal structures and filters in-house. When the project determines the filtration level, the filter size and resistance, FFU box sealing, fan target air volume and speed adjustment plan can be coordinated simultaneously, and passedFFU complete machine prototype test to verify matching results.
Before technical communication, it is recommended to provide the process area, particle control requirements, target air volume, detection basis, installation size, maintenance method and estimated quantity. The final filtration level and FFU configuration are subject to the project technical agreement and the test results under the agreed working conditions.
