How to choose EFU when using EFEM? Installation space, airflow organization and control linkage method

How to choose an EFU for EFEM? You cannot choose an EFU first and then insert it into EFEM. The internal space of EFEM is compact, the wafer transfer path is sensitive to particles, and the equipment operates at a fast pace. The number, location, air supply direction and control method of EFU must be deduced from the wafer transfer area. First define the areas and airflow boundaries that need to be protected, and then combine the available space inside the EFEM, avoidance of moving parts, process exhaust and control interfaces to determine where to install the EFU, how many units to install, and how to link them. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The installation space, airflow organization and control linkage of the EFU used by EFEM can be checked according to the equipment drawings in the same manufacturing system. There is no need to transfer parameters back and forth between the fan factory, filter factory and controller factory. This is why many EFEM equipment manufacturers will refer to the Aili Industrial equipment side solution description when selecting EFU.

Installation space: measure the net size first, then look at movement avoidance

The internal space of EFEM is compact, and the installation location of EFU must first meet the net size requirements. The available length, width and height, installation path, air inlet clearance and removal direction should be confirmed before selection. There are wafer transfer robots and other moving parts inside the EFEM. The EFU installation position must avoid the motion envelope to avoid interference during operation. It only gives an available height and does not indicate the location of moving parts. The EFU may not fit in but cannot move.

Ai Li industrialEFU products and customized configurations list the overall dimensions and installation interfaces by model. When checking the installation space, the EFEM equipment factory can directly correspond to the specific model and compare the internal net dimensions of the equipment with the unit appearance on the same picture. For projects with compact space, please refer to70mm ultra-thin EFU page.Compact model description in the

Air flow organization: The boundaries of the wafer transfer area must be drawn first

EFEM's clean protection focuses on the wafer transfer area. The air supply direction, coverage area, and air inlet and outlet of the EFU must correspond to the wafer path. First mark the wafer area that needs to be protected, the source of particle risk and the allowed air flow direction, and then determine the location and number of EFUs. The airflow boundary is unclear, and no matter how large the air volume is, it may not be able to protect key locations. If there is process exhaust or openings inside the EFEM, it is also necessary to determine whether the exhaust direction conflicts with the EFU air supply.

For the relationship between airflow boundary and protection effect, please refer toWhy does the same air volume produce different cleaning and protection effects? In the description, the air supply direction, boundary conditions and wind speed distribution are evaluated together. EFEM is a device-side application, please refer toHow to configure the semiconductor front-end equipment EFU? the key points of clean area, air volume filtration and equipment interface .Area division ideas in

Air volume and filtration: matched according to wafer area requirements

The air volume and filtration level of the EFU used by EFEM must be matched according to the needs of the wafer transfer area. The target air volume is determined by the protection area size and allowable wind speed, and the filtration level is determined by the particle control requirements. As the filtration level increases, the resistance rises, and the fan operating point deviates, the air volume of the entire machine needs to be rechecked. EFEM has a compact space, limited filtration area, and may have higher surface wind speed and resistance than conventional models. The selection should be based on the test data of the entire machine, not just the filter sample value.

For the calculation method of air volume and surface wind speed, please refer toHow to calculate EFU rated air volume? Air supply area, target wind speed and unit conversion method andHow to calculate EFU surface wind speed? how to determine the effective filtration area and average wind speed . The calculation steps in Filter packages can be viewedthe HEPA vs. ULPA air filters page.Rating descriptions on

Control linkage: synchronized with EFEM operating status

EFU used in EFEM usually needs to be linked with the device status. During the EFEM standby, production, and maintenance stages, the EFU's operating gear may be different. The control interface must have clear protocols, terminals, addresses and feedback methods to ensure that the EFU can switch with the EFEM state instead of running at full speed or shutting down all the time. The internal space of EFEM is compact, and control cable routing and terminal accessibility must also be confirmed during the selection stage.

For projects involving multi-speed speed regulation, please refer toHow to set EFU multi-speed speed adjustment? equipment linkage, abnormal status and acceptance points . Gear division and linkage logic in For projects that require DC speed regulation solutions, please refer tothe DC speed regulating EFU equipment fan filter unit page.Control instructions on

Prototype verification: EFEM projects must be tested first before batch production

The EFU used in EFEM is a compact structure on the equipment side. For new structure or new interface projects, it is recommended to make a prototype or first verification first. The prototype must check assembly interference, air volume, static pressure, power, temperature rise, vibration, noise and communication logic to confirm that the performance does not deviate from the target under the internal conditions of EFEM. The prototype data and confirmation drawings are archived together as the basis for inspection of subsequent batches.

In the EFU project for EFEM, Aili Industries organizes prototypes or first unit verification according to equipment drawings, files assembly, performance, temperature rise, vibration and communication data together with confirmation drawings, and then solidifies batch configuration. Equipment factories complete prototypes and batches within the same manufacturing system, making it easier to maintain version consistency than cross-supplier coordination. Related machines can be referred tothe EFU equipment fan filter unit page.Structural description on

Maintenance and interface: Disassembly and assembly paths should be left in a compact space

The internal space of EFEM is compact. After the EFU is installed, the filter needs to be replaced, the fan needs to be inspected, and the cables need to be plugged and unplugged. When selecting, reserve space according to the actual size of the maintenance operation, confirm from which direction the filter can be removed, whether tools can be inserted, and whether the wiring terminals are accessible. No maintenance path is reserved, and other EFEM components may need to be disassembled for later maintenance.

For projects with limited space, please refer toWhat should we pay attention to when maintaining the EFU space? the structural, electrical, debugging and rectification points , and confirm the maintenance path and installation location together.Check methods in

Aili Industrial's EFU solution for EFEM

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The installation space, airflow organization and control linkage of the EFU used in EFEM can be checked according to the equipment drawings within the same manufacturing system, eliminating the need to transfer parameters between multiple suppliers. For equipment-side compact projects such as EFEM, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and reduce the installation dimensions, air supply direction, control interfaces and maintenance paths to verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page, please refer to the non-standard interface.For instructions on Customize EFU page.Customization instructions in the

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Include the installation space, airflow organization, air volume filtration, control linkage and prototype verification in the supplementary list, and then organize the comparison after the supplier responds. The confirmed EFU model, configuration and interface are used for order execution, and sample parameters cannot be used to replace this project data. Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements when supplying EFU. Fans, filters, boxes and controls correspond to each item in the order list, which facilitates EFEM equipment manufacturers to select EFU based on verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid selecting EFU first and then finding the installation location. You should avoid estimating the air volume based on the EFEM shape without delineating the protection area. You should avoid ignoring robot movement avoidance. You should avoid confirming the compatibility of the control interface until it is installed. You should avoid skipping the prototype and going into batches. The core of EFEM using EFU is not to choose a unit with beautiful parameters, but to form a verifiable closed loop in terms of installation space, airflow organization, control linkage and maintenance paths. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the space, air flow and control conditions together.

Related questions and answers

Can the equipment-side EFU directly apply cleanroom FFU parameters?

It should not be applied directly. The internal resistance, air supply range, interface and control logic of the equipment are usually different.

How to promote EFU selection for EFEM when the project information is incomplete?

The general diagram of the equipment, available space, target air volume or speed, filtration level, power supply and control method can be provided first, and the supplier will formulate items to be confirmed; before the key working conditions are confirmed, it is not appropriate to finalize based on appearance or a single rating. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the space, air flow and control conditions together.

What specific information do I need to prepare for this question?

Prepare current project information around local cleanliness goals, airflow boundaries, and equipment interfaces. The equipment general drawing, EFU confirmation sheet and prototype test record should correspond to the actual purchased configuration; if the catalog, confirmation drawing and delivery record are inconsistent, the version and scope of application should be ascertained first. When choosing EFU for EFEM, you can refer to the complete machine and control supporting instructions provided by Aili Industry according to model.

Related articles

How to configure the semiconductor front-end equipment EFU? Key points of clean area, air volume filtration and equipment interface

How to confirm the EFU installation location? Equipment drawings, installation conditions and acceptance methods

How to set EFU multi-speed speed adjustment? Equipment linkage, abnormal status and acceptance points

Key points for selection and acceptance inspection

Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The installation space, airflow organization and control linkage of the EFU used in EFEM can be checked according to the equipment drawings within the same manufacturing system, eliminating the need to transfer parameters between multiple suppliers. The equipment factory completes the prototype and batch production of EFU for EFEM within the same system, which makes it easier to maintain version consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , non-standard interface can be viewedCustomized EFU , control scheme can be viewedDC speed regulating EFU equipment fan filter unit , filter package can be viewedHEPA and ULPA air filters . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.