What technical parameters should be included in the FFU purchase inquiry?

When purchasing FFU (Fan Filter Unit, fan filter unit), some buyers only provide the dimensions and quantity, and then require the manufacturer to quote immediately; some only state that the '100-level' 'H14' wind speed is 0.45m/s, but do not provide the installation structure, air volume conditions and control methods.

This information may not be enough to determine the same set of product configurations, and it is prone to problems such as quotations not being directly comparable, prototype parameters not matching, and on-site interfaces needing to be modified .

For projects such as clean room construction, semiconductor equipment, SMT equipment, lithium batteries and photovoltaics, a complete FFU inquiry does not necessarily require the purchaser to complete all designs in advance, but the application environment, size interface, air volume and speed, system resistance, filters, power supply control, testing requirements and procurement delivery conditions should be as clear as possible。

It is recommended to prepare in the following order:

Application scenario → Installation size and direction → Air volume/wind speed → Wind pressure and resistance → HEPA/ULPA → Electrical and control → Material interface → Test acceptance → Quantity and delivery date

1. First write clearly where FFU is used, not just the cleanliness level.

The first item in the inquiry is the actual application scenario。

Conventional clean room ceilings, clean sheds, inside semiconductor equipment and on top of SMT equipment may have different requirements for FFU installation height, airflow organization, maintenance space and control interfaces.

It should be noted: ISO cleanliness level is a comprehensive result of clean space. It cannot be simply assumed that FFU equipped with H13, H14 or ULPA filters will definitely reach the corresponding level. Air flow organization, personnel, equipment and operation management will also affect the cleaning effect.

Aili Industrial Application Supporting Advantages

Aili Industrial has a 30,000 square meter manufacturing base, and its products cover conventional FFU, equipment-side EFU, HEPA/ULPA filters and supporting control systems.

For conventional clean rooms, you can start checking from the FFU fan filter unit; if the installation space is limited and it needs to be linked with semiconductor equipment, you can further evaluate the equipment-side EFU.

Aili Industrial can configure products based on actual equipment structure and air parameters, rather than recommending fixed models based solely on cleanliness levels.

Related product information:

Aili Industrial FFU fan filter unit

https://ailigy.com/ffu.html

Aili Industrial EFU equipment end fan filter unit

https://ailigy.com/efu-fan-filter-unit.html

2. To what extent should the installation dimensions, openings and maintenance directions be written down?

The FFU inquiry form should at least indicate length × width × height (mm) , and whether the size refers to the shape of the box, the effective air outlet surface, or the installation opening.

For FFU installed in the keel, the ceiling module, support method and sealing interface must be provided; for equipment-side EFU, the installation hole position, air inlet clearance, obstacles and maintenance direction should also be provided.

It is also recommended to clarify:

• Overall dimensions: L×W×H, whether including mounting edges, flanges or handles.

• Installation method: ceiling, equipment top-mounted, side-mounted or non-standard fixed.

• Opening/Flange: Opening size, screw hole location, flange width and installation tolerance.

• Inlet and outlet direction: the positional relationship between the air inlet side and the filtered air outlet side.

• Maintenance methods: top maintenance, filter removal or other structural needs.

• Maintenance clearance: space required for disassembly, wiring and filter replacement.

FFU usually sucks air from the air inlet side and sends it out from the filter side after passing through the fan and filter. The installation drawings must indicate the actual air flow direction, and the fan air inlet screen cannot be used as the filter outlet surface.

Aili Industrial's structural manufacturing advantages

Aili Industrial has the capabilities of sheet metal processing, filter and complete machine manufacturing, and can check the structure around the overall dimensions, flanges, mounting hole positions, maintenance directions and layout of fans and filters.

For ultra-thin EFU and small-size device-side products, technical conditions can be further confirmed based on customer equipment drawings.

For non-standard projects, it is recommended to provide two-dimensional drawings or three-dimensional models of the equipment installation area when enquiring, so as to more accurately evaluate the processing structure and installation conditions.

3. How to write FFU air volume, wind speed and static pressure?

Air volume (m³/h), average outlet wind speed (m/s) and resistance/static pressure (Pa) are the most easily missed or confused group of parameters in the inquiry form.

When the effective air outlet area and average outlet wind speed are known, a preliminary estimate can be made:

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

For example, when the effective air outlet area is 1.0m² and the average wind speed is 0.45m/s, the air volume estimated according to the formula is about 1620m³/h.

This value only illustrates the calculation relationship and does not represent the measured performance of a specific FFU.

When making an inquiry, it is recommended to further clarify:

Aili Industrial’s fan motor matching advantages

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 fan configuration based on the target air volume, filter resistance, box structure and operation mode.

When customers need to adjust the FFU air volume, wind speed or operating mode, they can evaluate it together with the fan, motor, filter and control system.

It is recommended during the procurement stage that all performance parameters should be verified in the complete state of the FFU after the specified filter is installed.

4. What parameters should HEPA/ULPA provide so that it will not affect the quotation and performance?

The filter not only determines the particle filtration performance, but also directly affects the internal resistance of the FFU and the operating conditions of the fan.

Buyers should try to provide:

Filtration level → Implementation standards/testing methods → Rated air volume → Initial resistance → Size and thickness → Filter material and sealing method

Common configurations include H13, H14 grade HEPA filters, and ULPA filters such as U15, U16, and U17.

The actual grade shall be determined in accordance with project standards and technical agreements.

For key processes, it is also necessary to clarify leak detection requirements, test report forms and post-installation seal inspection responsibilities.

Don't just write '0.3μm filtration efficiency 99.99%' without explaining the test standards, efficiency level determination methods and inspection conditions.

Different expressions may lead to different product configurations adopted by suppliers.

Aili Industrial’s HEPA/ULPA matching advantages

Aili Industrial has the manufacturing capabilities of HEPA and ULPA air filters. It can simultaneously check the filtration level, rated air volume, resistance, size and sealing requirements, and confirm the matching with FFU fans and boxes.

The PTFE filter material or special filter structure required by the project can also be explained at the technical stage to avoid configuration changes after quotation.

Related product information:

Aili Industrial HEPA/ULPA High Efficiency and Ultra High Efficiency Air Filters

https://ailigy.com/HEPA-ULPA-air-filter.html

5. Regarding AC, DC, EC and power supply requirements, how should the inquiry form be written?

When FFU adopts different drive solutions, the costs, control methods and operating parameters may be different.

It is recommended that the inquiry form specify the following items:

• Power supply: Voltage, frequency, single phase or other site power requirements.

• Drive scheme: AC, DC or EC; if you are not sure yet, you can indicate that you need the manufacturer's recommendation.

• Speed ​​regulation mode: local switch, multi-speed speed regulation, external speed regulation or centralized control.

• Communication interface: whether RS485, RJ45 physical interface, Modbus, etc. are required.

• Group control requirements: total number of FFU units, number of regions, single control requirements and work/duty mode.

• Monitoring function: whether operating status, fault alarm or other specified functions are required.

It should be noted that RJ45 is only one form of connector, and the communication protocol, compatibility and group control capabilities cannot be inferred just by having an RJ45 interface.

High-volume FFU projects should have both parties confirm the control architecture, communication parameters and system debugging responsibilities.

Aili Industrial’s control system advantages

Aili Industrial has the ability to develop FFU control system software and hardware, and can configure stand-alone control and centralized control solutions based on project conditions.

For clean room projects involving hundreds, thousands or even tens of thousands of FFUs, it is recommended to clarify the controller capacity, regional divisions, communication methods and system architecture simultaneously during the inquiry stage.

This helps reduce duplicate wiring, driver configuration modifications and control system debugging issues later on.

Related product information:

Aili Industrial FFU Group Control System

https://ailigy.com/ffu-group-control-system.html

6. What structure, material and customization requirements must be included in the inquiry form?

For non-standard FFU and equipment-side EFU, outline drawings, partial structure drawings or assembly interface drawings should be supplemented.

Aili Industrial’s non-standard manufacturing advantages

Aili Industrial covers the manufacturing links of motors, fans, filters, sheet metal and complete machine assembly, and can jointly check product size and performance requirements around non-standard structures.

The overall height of some ultra-thin EFU solutions can be about 70mm, but whether it is suitable for specific projects needs to be judged based on the target air volume, filtration level, installation interface and technical confirmation results.

For flanged FFU, small size EFU, stainless steel FFU and other products, the corresponding structural configuration can be discussed in conjunction with actual drawings.

7. Why is it necessary to specify prototype testing and batch acceptance when making an inquiry?

For procurement projects of hundreds, thousands or even tens of thousands of FFUs, prototype or first article verification, mass production basis and delivery inspection scope should be agreed in advance , rather than just 'factory qualified'.

The advice is clear:

Air volume and wind speed test → Power and electrical inspection → Filter and seal inspection → Dimension confirmation → Control function test → Operation status inspection → Delivery of test data

For example, with the same requirement of 'wind speed 0.45m/s', different measuring points, different effective air outlet areas or different measurement states may produce results that cannot be directly compared.

Therefore, suppliers should be required to clarify the measurement conditions and test basis.

Aili Industrial’s quality control advantages

Aili Industrial has core component manufacturing and FFU complete machine assembly testing capabilities, and can discuss prototype verification, first article parameter confirmation and batch testing requirements based on project technical conditions.

For projects that require non-standard design or special operating conditions, the matching results of fans, filters, control systems and structures can also be verified before mass production.

The specific testing scope and factory information shall be subject to the specifications or technical agreement confirmed by both parties.

8. How should I fill in the purchase quantity and delivery conditions?

In addition to technical parameters, the inquiry form should also indicate:

Inquiry quantity, prototype quantity, batch quantity, model combination, estimated order time, expected delivery node, delivery location and packaging requirements.

For bulk purchases of multiple models, it is recommended to list each model separately to avoid mixing different filter levels, control modes or materials in the same quotation item.

For projects that require batch delivery, corresponding plans should also be listed according to the construction area or equipment installation rhythm.

Aili Industrial’s batch matching advantages

Aili Industrial has a 30,000 square meter manufacturing base and can evaluate manufacturing and project supporting plans based on specific models, technical conditions, purchase quantities and delivery arrangements.

The manufacturing system covers motors, fans, control systems, air filters, sheet metal processing and complete machine assembly, helping to coordinate related manufacturing requirements in the early stages of the project.

The actual quotation, production capacity and delivery time shall be subject to the drawings, BOM and order conditions confirmed by both parties.

9. FFU purchase inquiry form template: copy it and send it to the supplier

The following template is suitable for clean room FFU, and special parameters of equipment-side EFU can also be added as needed.

For items that are temporarily undetermined, you can fill in 'pending manufacturer's suggestion' or 'pending technical confirmation'. It is not recommended to fill in an estimated value at will.

It is recommended that all candidate suppliers quote based on the same inquiry form, and that technical deviation items be clarified.

This makes it easier to compare product configurations, additional options, detection ranges and actual delivery conditions.

10. How to compare quotations from different FFU manufacturers to avoid looking only at the unit price?

When there are differences in the FFU prices given by different suppliers, you first need to check whether they are based on the same working conditions and configuration quotations.

Key points to confirm:

Are the overall dimensions and installation interface the same?

Are air volume, wind speed and static pressure measured under the same working conditions?

Is the filtration level consistent with the initial resistance?

Are the power, drive and control methods the same?

Does it include FFU group control system?

Are the testing requirements, packaging, transportation and after-sales scope the same?

If these conditions are inconsistent, the two quotations usually cannot be sorted directly by unit price.

It is recommended to require suppliers to itemize technical deviations and optional configurations, and to verify key parameters at the prototype or first article stage.

Aili Industrial's overall machine synergy advantages

Aili Industrial relies on its motor, fan, filter, control system, sheet metal and complete machine manufacturing capabilities to coordinate key component parameters and non-standard structural requirements in the same project.

For different product configurations, technical confirmation can be carried out around air volume, static pressure, filtration level, structural size and control requirements, and corresponding FFU/EFU selection and technical communication support can be provided to buyers.

FFU Procurement Inquiry Frequently Asked Questions (FAQ)

1. When inquiring about FFU, can I only provide the size and quantity?

It can be used for preliminary communication, but is not sufficient to form a directly comparable technical quotation.

It is recommended to add application scenarios, air volume and speed, filtration levels, control methods and installation interfaces.

2. I don’t know how much air volume FFU needs. Can I inquire first?

Can.

It is recommended that the cleanliness target, installation size, process scenario and air flow requirements be provided first, and technical personnel will assist in confirming the feasible range, but the final performance needs to be clarified in the technical agreement.

3. Is it enough to just write 'H14 FFU'?

Usually not enough.

It is also necessary to confirm the filter size, rated air volume, initial resistance, sealing method, inspection requirements, and operating conditions of the fan and complete machine.

4. Do FFU wind speed and air volume need to be written at the same time?

It is best to state the target air volume, average wind speed and effective air outlet area at the same time.

If only one of them is provided, the corresponding calculation or test conditions need to be clarified.

5. Does the FFU purchase inquiry form need to write down the system static pressure?

If there are additional air ducts, internal flow resistance of the equipment, or clear residual pressure requirements, these should be written clearly.

If it cannot be determined temporarily, you can explain the actual operating conditions and conduct technical confirmation with the supplier.

6. Does FFU group control need to be determined during the inquiry stage?

It is recommended to clarify the total quantity, area division, communication interface and control requirements as early as possible to avoid later driver, wiring or controller configuration changes.

7. Can non-standard FFU be quoted by the manufacturer based on the drawings?

Yes, but technical quotes usually still require verification of air performance, filtration configuration, power control, assembly interfaces and test conditions.

8. Do I need to make a prototype first for thousands of FFUs?

Decisions need to be made based on product complexity and project risks.

For non-standard structures, special filtration or control solutions, and equipment-side clean applications, it is usually recommended to arrange prototypes or first article verification.

FFU selection, non-standard customization and procurement technical consultation

When preparing to purchase FFU, the purchasing personnel do not have to complete the entire aerodynamic design independently before inquiry, but they should the confirmed project conditions and the technical parameters that are yet to be recommended by the manufacturer .clearly distinguish between

Aili Industrial has a 30,000 square meter manufacturing base, and its 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 clean room FFU, ultra-thin EFU, equipment-side non-standard products, and project requirements for hundreds, thousands or even tens of thousands of units, the configuration and supply plan can be evaluated based on dimensional drawings, air parameters, filtration levels, control interfaces and purchase quantities.

Related products and technical information:

FFU fan filter unit

EFU equipment side fan filter unit

HEPA/ULPA air filter

FFU group control system

What is FFU? Structure, Principles and Applications

Aili Industry - From core components to FFU complete machines, it provides product selection, technology matching and customization support for clean engineering and equipment manufacturing projects.