Direct answer: Static pressure reflects the FFU's ability to overcome filter and system resistance and maintain target air supply. It makes more sense to check the available static pressure corresponding to the target air volume, rather than comparing one static pressure number in isolation.

How should the air volume and static pressure match when FFU is used for filter pressure difference? It is a common practical problem in clean room and equipment-side FFU projects. FFU is not a fan that works alone, but a terminal clean air supply unit composed of fan/motor, HEPA or ULPA filter, box structure, control system and clean room air flow organization. Therefore, selection and judgment cannot only look at one parameter, but must establish a complete matching relationship around the actual process conditions.

1. First clarify the tasks of FFU in the project

The project must first clarify the cleanliness level, application area, room or equipment size, dust generation from personnel and equipment, operating time, and whether there are local high cleanliness requirements. Only by determining the target first can we further determine the air volume, wind speed, static pressure, filtration efficiency and control method that FFU needs to provide.

2. How should the air volume and static pressure match when FFU is used for filter pressure difference? What should we focus on?

3. Why must air volume, static pressure and filter be judged together?

The air volume represents the amount of air actually sent by the FFU, and the static pressure reflects the fan's ability to overcome the resistance of the filter and the system. The filter itself will form resistance. Only comparing the maximum air volume cannot explain the operating status after installing the filter and entering the real system; only pursuing higher filtration efficiency may also change the fan operating point due to changes in resistance. Therefore, what is more valuable in engineering is to confirm the available static pressure under the target air volume and include the filter resistance in the same working condition calibration.

4. What order is recommended for FFU project selection?

Step 1: Clarify the cleanliness level, process and operating environment.

Step 2: Confirm installation dimensions, target air volume/speed, static pressure and uniformity requirements.

Step 3: Match HEPA or ULPA filter efficiency and resistance.

Step 4: Select a fan/motor solution based on continuous operation, speed regulation, energy consumption and power supply conditions.

Step 5: Determine single control, regional control or centralized group control, and reserve communication and expansion conditions.

Step 6: Batch projects are verified through prototype, factory inspection or on-site testing, and the final technical agreement and actual working conditions shall prevail.

5. Common misunderstandings in FFU selection

• Only the overall dimensions and purchase prices are compared, but the air volume and static pressure under the same working conditions are not compared.

• Take the maximum air volume directly as the design air volume and ignore the filter and system resistance.

• It is believed that the higher the filtration level, the better, without simultaneously checking the resistance, energy consumption and maintenance conditions.

• Group control, communication addresses, and partitions are only considered later in large-scale projects to increase debugging work.

• Ignore the space required for filter changes, motor inspections and control maintenance.

6. Project supporting ideas of Aili Industrial FFU

Aili Industry focuses on R&D and manufacturing of FFU and clean air equipment. The product supporting products cover key links such as fans/motors, control systems, sheet metal structures, and HEPA/ULPA filters. Standard clean rooms can be configured according to the ceiling module, cleanliness level and target air volume; for semiconductor equipment, SMT equipment, lithium battery production lines and projects with limited space, non-standard matching can be carried out based on actual size, air volume, static pressure, filtration and control conditions.

For batch FFU projects, Aili Industry places more emphasis on the matching of core components and the complete machine, as well as component testing, process control and complete machine testing. The purpose of this is not to pursue a certain parameter alone, but to allow the fan, motor, filter, box and control system to work together under the working conditions required by the project. Specific performance, configuration and delivery requirements are subject to the project technical agreement and actual test results.

7. What materials are recommended to be prepared before purchasing or technical communication?

8. Related products and further reading

For questions surrounding this article, you can continue to viewFFU product classification、HEPA/ULPA filter、FFU FAQs and Selection Guide。

9. FAQ brief answers

Q: Can FFU directly determine the quantity based on room area only?
Answer: Not recommended. The area is only the basic condition, and it must be calculated and verified based on the cleanliness level, room height, process dust, personnel and equipment, target air supply and air flow organization.

Q: Can FFUs of the same size be directly interchanged?
Answer: Not necessarily. You also need to check the air volume, static pressure, filter, power supply, control interface, installation method and actual operating conditions.

Q: Why is it recommended to confirm the prototype first for batch projects?
Answer: The prototype can be used to check the size, performance, control, filtration and maintenance conditions before batch implementation, reducing subsequent modifications.

Question: How to consult Aili Industrial for FFU selection?
Answer: It is recommended to prepare the application scenario, cleanliness requirements, size, air volume/wind speed, filtration level, power supply, control method and estimated quantity, and then match the specifications based on the actual working conditions.