When using FFU in clean corridors, what parameters need to be paid attention to most?

Direct answer: When choosing FFU for clean corridors, you should focus on checking the corridor cleanliness goals, the traffic conditions of people and materials, the designed air supply volume, the pressure difference relationship between the corridor and adjacent rooms, airflow distribution, filter resistance, and ceiling installation and maintenance space. Corridors are usually long and narrow with many door openings, and the configuration cannot be determined based only on the area or the nominal air volume of a single FFU.

Clean corridors connect different process areas and are also passages through which people and materials frequently pass. The opening of doors, the return and return air status of adjacent rooms, and the return air path of the corridor itself may all affect the actual air flow. therefore,The FFU fan filter unit should be placed in the entire clean room air flow organization for selection, rather than being judged as an independent device.

1. Cleanliness goals and traffic conditions

First, clarify whether the corridor is responsible for general clean passage, material transfer, or connecting local high-clean areas, and check the cleanliness level required by the project. Personnel density, transportation frequency and door opening methods should be included in the design and on-site verification conditions.

The relationship between the pressure difference between the corridor and adjacent rooms should also be clearly stated in the project drawings. FFU provides filtered supply air, but the pressure difference in the corridor also depends on the supply air, return air, exhaust air and the operating status of the door. The pressure difference cannot be guaranteed to meet the standard by simply increasing the number of FFU.

2. Target air volume and air flow uniformity

The selection should confirm the required air supply volume for each corridor zone, and then check the effective air volume after a single FFU is equipped with the specified filter. In particular, for long and narrow corridors, it is necessary to check whether the arrangement of FFU along the corridor is even, and whether obvious airflow weak areas are formed at doorways, corners, or locations with frequent transportation.

If the total air volume meets the requirements, it only means that the initial calculation of the quantity is established; the actual effect must still be confirmed through wind speed, air flow distribution and on-site cleanliness tests. The maximum air volume of FFU cannot be directly regarded as the design air volume.

3. Static pressure and filter resistance

The efficiency of the HEPA or ULPA filter should meet the cleanliness requirements of the corridor, and its resistance at the design air volume should also be checked. After the filter resistance increases, whether the FFU can continue to provide the target air supply should also be reflected in the fan performance and maintenance conditions.

When comparing different FFUs, air volume and static pressure data with the same filter configuration, operating gear, and test method should be used. It is difficult to judge the operating capacity of the corridor after installation by comparing 'maximum static pressure' in isolation.

4. Ceiling space, noise and control zones

Corridor ceilings often also accommodate lighting, sprinklers, electrical and other facilities. FFU size, installation height, maintenance direction and filter replacement space should be checked together in the layout drawing stage. In areas where people continue to pass through, attention should also be paid to the noise at the actual operating gear.

Longer corridors can be divided into FFU control zones according to functional areas and operational needs. If unified speed regulation or condition monitoring is required, it can be evaluated during the design stage.The FFU group control system enables the power supply, communication and debugging plans to be determined simultaneously with the ceiling layout.

How does Aili Industry cooperate with the clean corridor project?

Aili Industrial can combine the length and width of the corridor, ceiling module, cleanliness requirements, target air volume and control method to match the FFU machine and filter configuration. For batch projects, it is recommended to first confirm the prototype performance and installation conditions, and then carry out on-site air volume, airflow distribution and cleanliness verification according to the technical agreement. Specific specifications and quantities are subject to project conditions and test results.

Before technical communication, it is recommended to provide the floor plan of the corridor, the use of adjacent rooms, the location and access methods of doors, cleanliness and pressure difference requirements, ceiling layout, power supply and control requirements. This information helps determine installable and maintainable FFU solutions.

Q: Can clean corridor FFU be calculated based on area only?
Answer: The area can be used for preliminary calculation. The target air volume, door position, supply and return air organization and air flow uniformity should also be checked.

Question: Can increasing the FFU increase the pressure difference between the corridor and the room?
Answer: The pressure difference depends on the overall air supply and return air and the operating status of the door. System airflow balance should be checked before adding FFU.

Q: What is the focus of corridor FFU acceptance?
Answer: Focus on checking the air volume, airflow distribution, cleanliness and the pressure difference relationship between the corridor and adjacent areas under the agreed working conditions.