What tests should be done to verify the FFU prototype before entering into bulk purchase?

For clean room engineering, semiconductor equipment and automation equipment supporting projects, the fact that the FFU prototype can be started does not mean that the conditions for bulk purchase are met . Especially when the order involves hundreds, thousands or even larger scales, purchasers need to confirm not only the performance of a prototype, but also whether the test conditions, installation interfaces, filter configurations and subsequent production versions can be consistent.

So, what items should be verified before the FFU prototype is transferred to mass production? What test results need to be recorded? How to deal with deviations after they are discovered?

A clear verification path is recommended:

Technical version lock → Appearance installation verification → Air volume, speed and static pressure test → Filter and seal inspection → Electrical and control verification → Noise, vibration and operation inspection → Problem closure → First article approval and mass production release.

Pictured: Overview of FFU prototype testing and bulk purchase release

1. What conditions should be confirmed before testing the FFU prototype?

Prototype verification must first ensure that both purchasers are testing the same version and working conditions . products of Simply writing 'wind speed 0.45m/s, H14 filter' is usually not enough to constitute a complete verification condition.

For example, if the equipment-side EFU is installed above a narrow cabinet, the air inlet space and internal resistance of the equipment may be different from those of the open test bench. Actual usage conditions should be included in the verification plan during acceptance.

How does Aili Industry support prototype technology confirmation?

Aili Industrial has the capabilities to manufacture motors, fans, HEPA/ULPA filters, control systems, sheet metal and complete machines. It can collaboratively check product drawings, air volume requirements, filtration configurations and control interfaces during the prototype stage. For non-standard projects, it is recommended to confirm the structure and test conditions first, and then lock in the mass production version to avoid repeated drawing changes after entering mass production.

For general FFU product configuration, please refer toAili Industrial FFU fan filter unit。

2. What inspections are required for the overall dimensions and installation interface of the FFU?

Shape confirmation is the most basic step in prototype verification, but it is also the most easily overlooked step. Even if the air volume is qualified, the product may not be installed if the flange, fixing hole position, or maintenance space does not match.

Suggested verification:

·        Length, width, height and mounting side: Specify whether the dimensions include flanges, mounting brackets and external components.

·        Installation hole locations and openings: Check the location, quantity, hole diameter and interface tolerances against the official drawings.

·        Air inlet and outlet direction: Ensure that the actual air flow path is consistent with the equipment drawing; the air inlet side of the FFU fan and the air outlet side of the filter cannot be confused.

·        Filter disassembly and assembly: Check the maintenance direction, locking structure and the space required for replacement.

·        Cable and control interface: Confirm the plug position, wiring port and risk of mechanical interference.

Aili Industrial's structural advantages: relying on sheet metal processing, fan filter matching and complete machine assembly capabilities, the installation structure and performance configuration can be checked simultaneously according to the equipment drawings. For ultra-thin EFU, flanged FFU and small-sized equipment-side products, the interface size should be included in the first article approval item.

Please refer to the non-standard supporting equipment on the equipment side.Aili Industrial EFU products。

3. How should the prototype be tested for air volume, outlet wind speed and uniformity?

The air volume and wind speed test cannot just copy one promotional parameter. It is necessary to record the status of the complete machine after assembling the specified filter , as well as the gear, resistance and measurement method during testing.

1. Air volume test

Confirm whether the whole machine reaches the target air volume under the agreed operating conditions; if there is additional resistance or air ducts of the equipment, the external resistance conditions must also be stated. Do not use the fan's no-load maximum air volume as a substitute for the overall performance of the FFU.

2. Surface wind speed and uniformity

If the project focuses on one-way flow or local clean air supply, the wind speed at each point should be recorded according to the measurement plane, measurement point layout and measurement distance agreed upon by both parties, calculate the average value, and determine whether the distribution meets the requirements according to the agreed method. If the average wind speed is qualified, it does not mean that all measuring points are qualified.

3. Different operating gears

If the project has normal production, duty or other operating modes, it should be tested separately according to actual requirements to avoid verifying only the highest gear.

When the effective area, average wind speed and measurement conditions are clear, the air volume can be estimated using the formula:

Air volume (m³/h) = effective air outlet area (m²) × average wind speed (m/s) × 3600.

This formula is used to explain the relationship between parameters and cannot replace the measurement of the entire machine under agreed working conditions.

Advantages of Aili Industrial's fan motors: Aili Industrial has the capability of independent R&D and manufacturing of motors and independent R&D and production of fans. It can check the working point of the fan based on the filter resistance and the target air volume. When deviations in air volume or uniformity are found, a joint analysis will be conducted from the aspects of motor drive, air path structure, filter resistance, etc.

4. How should HEPA/ULPA filters and installation seals be verified?

Pictured: FFU filter specifications and installation sealing inspection

During the prototype stage, should be verified separately the filter's own data and the integrity of the filter after installation . The two cannot be confused.

Filter efficiency level testing, leak detection of the filter itself and leak detection of the filtration system after installation in the clean room target different objects and conditions. The filter media efficiency report provided by the supplier cannot be equated with the completion of complete machine or on-site installation leak detection. For projects with clear requirements, the applicable testing methods and responsible parties should be agreed upon in the technical agreement.

Aili Industrial’s filter matching advantages

Aili Industrial has the capabilities of HEPA/ULPA filter manufacturing and FFU complete machine matching. It can simultaneously check the filtration level, rated air volume, resistance, size and sealing structure during the prototype stage, reducing changes in complete machine parameters caused by individually adjusting the filter in the later stage.

Related information can be viewedAili Industrial HEPA/ULPA Filter。

5. Which functions of electrical safety, speed regulation and group control interfaces should be tested in advance?

Pictured: FFU electrical and control interface verification

Prototype verification should not only check 'whether it can be turned on'. The power supply, electrical protection and control functions should be verified under safety conditions and agreed standards, and the configuration version should be recorded.

·        Power supply and wiring: Voltage, frequency, wiring, protective grounding and other items should be checked according to applicable product requirements.

·        Start, stop and speed adjustment: Check start, stop, speed adjustment and status feedback according to the set gear.

·        Communication interface: Conduct project-based testing on RS485, designated protocols, address settings, and communication exception handling.

·        Group control and partitioning: If the prototype will be used in a control network composed of a large number of FFUs, the actual required partitioning, unified start and stop, operating mode and single-machine control logic should be tested.

·        Exception handling: Whether scenarios such as power outage, restart, communication interruption, etc. need to be verified should be clarified according to the project control plan.

Note that RJ45 represents the interface form and does not mean that the communication protocol is compatible. Different control functions should not be written as standard for all FFU models without confirmation.

Aili Industrial’s control system advantages: Aili Industrial has control system software and hardware development capabilities, and can incorporate FFU drive solutions, speed regulation logic and group control interfaces into prototype verification. For clean projects involving hundreds, thousands or even tens of thousands of devices, it is recommended to first confirm the control architecture and compatibility, and then lock in relevant electrical configurations in batches.

Control products can be referred toAili Industrial FFU Group Control System。

6. Noise, vibration, power and continuous operation, do you still need to check?

Pictured: FFU operating status and stability verification

It needs to be determined based on actual usage requirements. For semiconductor equipment, precision optics and other vibration-sensitive working conditions, the following items may also be paid attention to during the prototype stage:

The current filter status and operating mode should be recorded during the test. For example, if the noise is eliminated by reducing the rotational speed, but the air volume is not up to standard at the same time, this cannot be regarded as an effective rectification result.

Aili Industrial's overall machine synergy advantage: Under the condition that the motor, fan, box and control system can all be evaluated collaboratively, when noise, vibration or power deviation occurs, the cause can be checked in the pneumatic, mechanical, structural and control directions. The actual verification items and qualified values ​​are subject to the confirmed technical agreement.

7. When the prototype fails, what should be done before entering mass production?

For test deviations, it is not recommended to just verbally say 'fix it in batches'. A more reasonable approach is to form a simple, traceable closed loop:

Record the deviation → Determine the scope of impact → Analyze the reasons → Clarify the content of the changes → Update the drawings/BOM → Retest the affected items → Confirm by both parties.

For changes involving fans, motors, filters, control procedures or installation structures, it should be evaluated whether they affect other passed test items. If necessary, add related items for retesting.

How does Aili Industry cooperate with technological rectification?

Aili Industrial's motors, fans, filters, sheet metal, control systems and complete machine manufacturing links can collaboratively check the causes according to project problems. For modifications that affect the mass production version, it is recommended to clarify new drawings, material configurations and retest records to prevent prototype modifications from not being synchronized into the batch technical files.

8. After the FFU prototype is approved, what conditions are required to release bulk purchase?

Pictured: FFU prototype verification and mass production release list

Just because the prototype has passed the test does not mean that all batches have passed the verification. To move from prototypes to bulk procurement, it is also necessary to convert verified technical conditions into executable production, testing and delivery basis.

The following checklist is recommended:

It is not required that all FFU projects use the exact same test mix. Required test items, optional test items and approval responsibilities should be determined based on actual risks, installation conditions and contract technical specifications.

Aili Industrial’s batch matching advantages

Aili Industry has a manufacturing base of 30,000 square meters, and its production facilities cover motors, fans, filters, control systems, sheet metal and complete machine assembly. For non-standard and large-volume FFU projects, supporting assessments can be conducted around prototype technology confirmation, key materials, production processes and inspection items.

The specific batch capacity, inspection scope and delivery cycle are subject to the actual model, order quantity and the production plan confirmed by both parties.

9. FFU Prototype Verification and Mass Production Procurement Frequently Asked Questions (FAQ)

1. Can the FFU prototype only measure wind speed?

Usually not enough. At least the appearance installation, electrical control, filter configuration and overall machine performance under agreed working conditions should be confirmed based on the project; other projects should be selected based on risk and technical specifications.

2. If the FFU average wind speed meets the requirements, does it mean that the wind speed uniformity also meets the requirements?

Doesn't mean. The average value cannot reflect the distribution of all measurement points. For projects that require airflow uniformity, the measuring points and judgment methods should be agreed separately.

3. The HEPA filter has a test report. Do I still need to check the FFU seal?

Assembly sealing condition needs to be verified. The test data of the filter body cannot directly replace the installation integrity confirmation after it is installed into the FFU; whether special leak detection is required should be determined according to the project agreement.

4. After replacing the motor or control board of the prototype, can the original test report still be used directly?

It should not be used without judgment. The impact of the changes should be assessed, affected performance or security items should be retested, and new technical versions should be recorded.

5. What additional verification is required for FFU or EFU used in semiconductor equipment?

It is usually necessary to pay more attention to actual working conditions such as equipment interfaces, air inlet space, airflow distribution, vibration, static electricity or communication; additional items are confirmed by the equipment manufacturer and supplier.

6. After the FFU prototype is passed, do batch products still need to undergo the same test for each unit?

Full inspection, random inspection and factory delivery items for batch inspection should be determined according to the contract, applicable standards and risks. Prototype verification, batch factory inspection and on-site clean room acceptance belong to different links and should not be confused.

7. Can Aili Industrial cooperate with the technical verification of FFU prototypes and batch projects?

Aili Industrial can discuss the fan, filter, structure, control and complete machine test items based on the project specifications, prototype configuration and related technical requirements, and carry out supporting and production evaluation according to the confirmed plan. Specific testing capabilities, methods and documentation should be clarified during the project phase.

10. FFU prototype verification and bulk purchasing technical consultation

When preparing to verify the FFU prototype, it is recommended to first provide product drawings, target air volume or speed, filtration level, installation conditions, power control, testing items and estimated purchase scale.。

Aili industrial manufacturing system covers:

Motor R&D and manufacturing → Independent R&D and production of fans → Control system software and hardware development → HEPA/ULPA filter manufacturing → Sheet metal processing → FFU/EFU complete machine assembly and testing.

For conventional clean room FFU, equipment-side EFU, ultra-thin and non-standard products, prototype technical conditions and batch configuration can be collaboratively confirmed according to specific working conditions to help purchasing customers establish a clearer basis for verification and acceptance.

Learn about product and technical information:

·       FFU fan filter unit

·       EFU equipment side fan filter unit

·       HEPA/ULPA air filter

·       FFU group control system

Aili Industry - From core components to FFU complete machines, we use manufacturing and technology collaboration to support prototype verification, non-standard development and batch project support.