What is the function of device-side EFU? Position and usage boundaries of equipment-side clean air supply

What is the function of the device-side EFU? You can't just answer 'send clean air'. The function of the equipment-side EFU is to form a local clean air supply inside or on the side of the equipment, deliver filtered air to key areas, and reduce particle contamination of sensitive components such as wafers, optical components, and mounting locations. Its scope of action is a local area inside the equipment, not the entire clean room. To understand the role of the equipment-side EFU, you must also look at its position in the air path, where the filter boundary is, how much boost the fan provides, how the equipment interface cooperates, and which problems are not within the scope of the EFU. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The complete machine composition, filtering configuration and control interface of the equipment-side EFU can be checked according to the equipment drawings in the same manufacturing system. This is why many equipment manufacturers will refer to the Aili Industrial product description when understanding the functions of equipment-side EFU and planning and selection.

Position in the air path: from intake to supply air

The equipment-side EFU is responsible for the 'suction-filtration-pressurization-sending' section in the air path. The air enters the EFU air inlet from inside or outside the equipment, is filtered by the filter, is pressurized by the fan, and then sent from the air outlet to the critical area of ​​the equipment. Its position in the air path determines which section it is responsible for and which section it is not responsible for. The return air path, process exhaust and overall airflow organization inside the equipment are usually coordinated by the equipment designer and are not the sole responsibility of the EFU.

Regarding the composition and working principle of EFU in the whole machine, please refer toWhat is EFU? The structure, function, working principle and applicable equipment description are explained in the description, and the function of the equipment-side EFU is understood in the air path of the whole machine.

Filtration boundary: to what extent it is filtered, determined by grade and sealing

The filtration effect of the EFU on the equipment side depends on the filter grade and sealing status. The filter grade determines how large particles can be filtered out, and the sealing status determines whether there is a bypass for unfiltered air. If the grade is selected high but the sealing is not in place, the actual protection effect will still be reduced. The filtration boundary of the EFU at the equipment end is the path after the filter outlet surface and before it is sent to the critical area. The sealing and cleanliness status on the path also affects the final effect.

Ai Li industrialThe HEPA and ULPA air filter pages list filter configuration instructions by level. When confirming the filtration boundary, the equipment manufacturer can directly correspond to the model and check the filter level, sealing method and leak detection conditions together. Regarding the selection method of H13 filter, please refer toHow to choose H13 filter for EFU? efficiency, resistance, sealing and overall machine matching methods .Check points in

Fan boost: provides air supply power, but is not equal to system pressure control

The EFU fan at the equipment end is responsible for providing air supply power, overcoming the resistance of the filter and the internal air duct resistance of the equipment, and delivering clean air to key areas. Fan boosting solves the resistance problem in the EFU air supply section and is not equal to the overall pressure control of the equipment. The pressure balance inside the equipment, the relationship between process exhaust and supplementary air still need to be coordinated by the equipment designer. Attributing the overall pressure problem of the equipment to the EFU fan often fails to solve the fundamental problem.

Regarding the relationship between the fan working point and the matching of the whole machine, please refer toHow to choose EFU centrifugal fan? working point, power, temperature rise and continuous operation requirements is to confirm the pressurization effect of the EFU at the equipment end under the resistance condition of the whole machine.The verification method of

Equipment interface: Cooperate with equipment structure, control and maintenance

Whether the device-side EFU can play its role depends on the device interface. The installation location determines the air inlet clearance and outlet coverage, the control interface determines whether it can be linked with the equipment, and the maintenance path determines whether the long-term operating status can be maintained. If the interfaces do not match, the performance of the EFU itself is up to standard, and it may not work well when installed on the device. The role of the device-side EFU is not played in isolation, but is realized together with the device structure, control logic and maintenance methods.

Ai Li industrialEFU products and customized configurations list installation interfaces and control supporting instructions by model. Equipment manufacturers can directly correspond to specific models when planning equipment-side EFU, and put the installation location, control interface and maintenance path on the same confirmation diagram.

Usage boundaries: Which issues are not within the scope of EFU

Understand the role of the device-side EFU, and also understand which problems are not within its scope. The overall cleanliness level of the equipment, the pollutants taken away by the process exhaust, the external environment of the equipment, and the particles brought in by personnel operations cannot be solved by a single EFU. EFU is responsible for the clean air supply in local areas inside the equipment. The overall cleanliness goal of the equipment requires the cooperation of the equipment designer, process side and EFU supplier. Only by drawing clear boundaries can there be a reasonable basis for selection and acceptance.

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, consider the scope of the EFU together with the airflow conditions inside the device.

Applicable equipment: The scope of action changes with the equipment scene

The scope of the device-side EFU changes with the device scenario. Semiconductor front-end equipment focuses on the local cleanliness of the wafer path, EFEM focuses on the protection of the wafer transfer area, lithography equipment focuses on the cleanliness of the optical path, and SMT placement machines focus on the protection of the mounting area. Different equipment has different installation locations, target air volumes and maintenance methods, and the EFU functions are also different. When selecting, first clarify the equipment scenario and protection area, and then determine the number, location and operating gear of EFU.

For EFU configuration methods of different devices, please refer toHow to configure the semiconductor front-end equipment EFU? the key points of clean areas, air volume filtration and equipment interfaces .Area division and interface confirmation ideas in

Aili Industrial's equipment-side EFU solution

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The overall composition, filtration configuration and control interface of the equipment-side EFU can be checked according to the equipment drawings within the same manufacturing system, without the need to transmit parameters back and forth between the fan factory, filter factory and controller factory. For partial cleaning projects at the equipment end, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and reduce the action area, filter boundary and control interface to verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page and the DC speed regulation scheme can be viewedThe structure description on the DC speed regulating EFU equipment fan filter unit page.Control instructions on

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Add the action area, filter boundary, fan pressure increase, equipment interface and usage boundary to 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. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. Fans, filters, boxes and controls correspond to each item in the order list, which facilitates the equipment manufacturer to place the role of the equipment-side EFU on the verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to equate the equipment-side EFU with the overall cleanliness plan of the equipment. It should be avoided to attribute the overall pressure problem of the equipment to the EFU fan. It should be avoided to only confirm the filter grade but not the sealing status. It should be avoided to ignore the impact of the installation position on the air supply coverage. It should be avoided to blame the external pollution problem of the equipment on the EFU. The role of the equipment-side EFU is local and has boundaries. Only by clearly drawing the boundaries can the selection and acceptance be based. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the action area, interfaces and boundary conditions together.

Related questions and answers

Is the EFU equivalent to a regular supply fan?

no. EFU also includes filtration, sealing, structure and control requirements, which should be evaluated according to the operating conditions of the entire machine.

How to promote equipment-side EFU selection when the project information is incomplete?

The equipment general diagram, available space, target air volume or wind 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 action area, interfaces and boundary conditions together.

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

Prepare current project information around functional boundaries, rated operating conditions and equipment interfaces. The equipment general drawing, EFU confirmation sheet and complete machine 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 understanding the function of the EFU on the device side, you can refer to the complete machine and interface supporting instructions provided by Aili Industry by model.

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What is the function of device-side EFU? Position and usage boundaries of equipment-side clean air supply

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 complete machine assembly. The overall composition, filtering configuration and control interface of the equipment-side EFU 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 matching of the device-side EFU and the complete machine in the same system, which is easier to maintain version consistency than cross-vendor coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , the 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.