How should the air volume and static pressure match during the FFU air volume test?

Direct answer: First determine the target air volume required by the project, and then check whether the FFU can overcome the resistance caused by the specified filter and actual installation conditions at this air volume. The air volume test should record the filter configuration, operating gear and related pressure difference data at the same time; the 'maximum air volume' and 'maximum static pressure' under different working conditions cannot be put together to judge the performance.

FFU air volume and static pressure are related to each other. Changes in resistance will change the working point of the fan, thereby affecting the actual air supply volume. Therefore, for clean room and equipment-side projects, the purpose of air volume testing is not only to obtain a value, but also to confirmWhether the FFU fan filter unit can continue to supply air under the design conditions after installation.

Why can't maximum air volume and maximum static pressure be paired directly?

The maximum air volume and maximum static pressure in the product information may come from different test conditions, and usually cannot be achieved at the same time. What you need to check for project selection is the performance data corresponding to the target air volume , and clarify the measurement location and test conditions of static pressure.

If two FFUs are rated for the same air volume, but one cannot achieve the target air volume after being equipped with the filter specified for the project, the two cannot be considered equivalent for the project.

Before air volume test, first fix the filter and operating conditions

should be used consistent with project deliverablesHEPA or ULPA filter , and record the model, installation status and resistance during testing. Also determine power supply conditions, FFU operating gear or control settings, as well as test locations and measurement methods.

Test with a low-resistance filter and replace the filter upon delivery. The original air volume data may not represent the final configuration. Equipment-side projects should also include conditions such as the air inlet and outlet interfaces and the internal structure of the equipment into testing or verification.

How should the test results be viewed together?

First confirm whether the actual air volume reaches the design value, and then check the corresponding filter pressure difference, related system resistance and FFU operating status. If the air volume is insufficient, you should check the filter resistance, speed adjustment settings, inlet and return air conditions and measurement methods instead of immediately adjusting the FFU to the highest gear.

The site should also pay attention to the uniformity of the outlet wind speed. The total air volume is qualified, but the air supply at key process locations is uneven, and the layout or air flow organization still needs to be adjusted. Batch projects should use consistent test conditions to compare different FFUs to avoid misjudgment of performance differences due to different gears or filter configurations.

How to consider resistance changes during operation?

After the filter has been running for a period of time, the resistance may change. When running at a fixed speed, the air volume may decrease; when speed adjustment is used to maintain the air volume, the operating gear and power consumption may increase. Therefore, in addition to stipulating the test conditions in the initial state, the technical agreement should also clarify the air volume, resistance monitoring and treatment requirements during the operation and maintenance phase.

Aili Industrial can combine the target air volume, filter resistance, installation size and control method to match the fan, motor, filter and box structure. For batch projects, it is recommended to confirm the working points corresponding to air volume and static pressure through a prototype, and then carry out complete machine and on-site testing according to agreed conditions. The specific performance is subject to the project technical agreement and actual test results.

Question: If the air volume reaches the standard, does the static pressure necessarily qualify?
Answer: Not necessarily. It is also necessary to confirm whether the resistance conditions and measurement locations corresponding to the test are consistent with the project requirements.

Question: Can the maximum static pressure of the two FFUs be directly compared?
Answer: You cannot judge based on the maximum static pressure alone. Their performance should be compared with the same filter, target air volume, and operating conditions.

Q: What should be recorded in the air volume test report?
Answer: At least the filter configuration, operating gear, test method, actual air volume, and pressure difference or resistance data of the agreed measuring points should be recorded.