What parameters should be looked at in the FFU air volume test? How to accept clean room and equipment projects?

Direct answer: The FFU air volume test not only depends on the final air volume value, but also records the filter configuration, operating gear, test position, air outlet area, wind speed uniformity, filter resistance and on-site installation status. Only when the test conditions are consistent with the project design conditions can the data have selection and acceptance value.

The same stationof the FFU fan filter unit may be different after factory testing and on-site installation in the clean room. The measured air volume Filters, speed gears, inlet and return air conditions and measurement methods will all affect the results. Therefore, 'nominal air volume meets the standard' cannot replace testing under project working conditions.

1. First confirm which air volume is being tested

The project should make it clear whether the air volume of the prototype machine, the air volume of the factory complete machine, or the on-site air supply volume after installation is to be compared. The installation environment and test conditions of the three may be different, and the values ​​under different conditions cannot be directly juxtaposed.

It is recommended that the target air volume, allowable deviations, test locations and measurement methods be specified in the technical agreement. For batch projects, the sampling inspection method and the consistency requirements between different FFUs should also be agreed upon.

2. Record filters and operating conditions

It should be noted when testingThe model, specifications and installation status of the HEPA or ULPA filter , and record the power supply conditions, operating gears or control settings of the FFU. The filter resistance will affect the fan operating point. After using a different filter, even if the motor and box remain unchanged, the original air volume data cannot be used directly.

If you need to compare different solutions, try to keep the filter configuration, operating gear and test conditions consistent. For long-term operation projects, the air volume calibration requirements after the filter resistance changes can also be agreed upon.

3. Measure wind speed and uniformity simultaneously

The average wind speed at the FFU outlet can be used to estimate the air supply volume, but the calculation must use the agreed effective air outlet area and adopt a suitable measuring point arrangement. Measuring only one wind speed value at the center of the air outlet cannot represent the air volume of the entire FFU, nor can it be judged whether the air supply is uniform.

Clean room projects should also pay attention to the airflow distribution in the work area; equipment-side projects should consider the impact of equipment openings, internal structures, and air inlet and return paths on measurement results. The air volume meets the requirements, but the local wind speed is obviously uneven, which may still affect the air supply effect in the process area.

4. Put the air volume and resistance data together to judge

The test results should try to record the filter pressure difference, related system resistance and FFU operating status at the same time. When the air volume is low, you can use this to determine whether the problem is caused by filter resistance, speed settings, installation conditions, or measurement methods. Comparing 'maximum air volume' or 'maximum static pressure' alone cannot prove that FFU can meet both requirements at the same time under target operating conditions.

How does Aili Industry cooperate with FFU air volume verification?

Aili Industry can match fans, motors, cabinets and control solutions based on the cleanliness requirements, installation dimensions, filter configuration and target air volume provided by the project. Before bulk purchasing, it is recommended to confirm the prototype test conditions first; after installation, conduct on-site testing according to the technical agreement to check the air volume, wind speed uniformity and actual operating status. Specific performance and acceptance results are subject to data under agreed working conditions.

When making inquiries or inquiries, it is recommended to provide target air volume or speed, filter requirements, installation drawings, power supply and control methods, estimated quantities, and planned test methods. The performance data provided by the supplier will be easier to use for project comparison if the information is complete.

Q: Can the FFU air volume test only measure the wind speed at the center of the air outlet?
Answer: Not recommended. Measuring points should be arranged according to the agreed method, and the air volume should be calculated or measured based on the effective air outlet area.

Q: The factory air volume is qualified, does it still need to be tested on site?
Answer: Testing is recommended. On-site air intake and return, installation structure and operating settings may be different from factory conditions.

Q: How to compare the air volume data of different FFU?
Answer: First check the filter configuration, operating gear, test position and measurement method, and then compare the results under the same working conditions.