How to choose small size EFU? Space, air volume, static pressure, heat dissipation and maintenance points

How to choose a small-size EFU? Don’t just look at its small appearance. Small-sized EFU is designed for locations with limited internal space in the equipment. However, after the size is reduced, the fan suction conditions, filter effective area, internal air duct resistance and heat dissipation conditions will also change. The fan is smaller and provides limited static pressure; the filter area is compressed and the surface wind speed increases; the box space is small, and the motor and driver have tighter heat dissipation. When choosing a small-sized EFU, you need to recheck the air volume, static pressure, heat dissipation and maintenance paths in a limited space, rather than scaling down conventional models. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The structure, power and filtration conditions of small-size models can be checked according to equipment drawings within the same manufacturing system. This is why many equipment manufacturers will refer to Aili Industrial's compact solution instructions when selecting small-size EFUs.

Space boundary: measure the net size first, then look at the installation path

The first constraint for small-sized EFUs is space. The available internal length, width and height of the equipment, installation path, air inlet clearance and removal direction should all be confirmed before selection. Only one available size is given, and the installation path and maintenance space are not explained. The selected small-size model may not be able to be installed or maintained. Small size EFU has a small appearance, but still requires space for installation paths and maintenance operations.

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

Air volume and static pressure: Small size does not mean low performance, but it should be checked according to the data of the whole machine

The air volume and static pressure of small-sized EFU cannot be directly used as the data of conventional models. After the size is reduced, the fan suction conditions and internal air duct resistance change, and the working point of the same fan in a small box is different from that in a conventional box. The filter area is compressed, the wind speed increases under the same air volume, and the resistance and noise may change. When selecting a model, check the target air volume, external static pressure and input power based on the complete machine test data of the small-size model, rather than selecting based solely on the sample ratings.

For the calculation relationship between air volume and resistance, please refer toHow to calculate EFU rated air volume? The method in the air supply area, target wind speed and unit conversion method is to confirm the air volume of the small-size model under the resistance condition of the whole machine. For the calculation method of face wind speed, please refer toHow to calculate EFU surface wind speed? How to determine the effective filtration area and average wind speed .

Heat dissipation conditions: The temperature rise in the small box must be confirmed separately

The small size EFU squeezes the motor and driver into a smaller box, reducing the heat dissipation area, and the temperature rise during continuous operation may be higher than that of conventional models. When selecting, confirm the temperature rise data of the motor and driver under the target operating conditions, and whether the box has a heat dissipation structure. If the temperature rise exceeds the limit, it may slow down the protection in the slightest, or affect the service life in the worst case. The heat dissipation check of small-size models cannot only look at short-term test data, but must be confirmed based on continuous operating conditions.

In the small-size EFU project, Aili Industrial checked the temperature rise of the motor and driver according to continuous operating conditions, and confirmed the heat dissipation conditions as part of the complete machine configuration. For projects involving speed-regulated operation, please refer tothe DC speed regulating EFU equipment fan filter unit page.Control and heat dissipation instructions on

Filter configuration: area reduction needs to be re-matched

The effective area of ​​the filter of small-sized EFU is usually smaller than that of conventional models. At the same air volume, the wind speed increases, and the resistance and noise change. When selecting, recheck the filter grade, effective area, surface wind speed and resistance to confirm that the equipment cleanliness requirements can still be met under the target air volume. If only the filter model of the conventional model is applied, the surface wind speed may be too high or the resistance may exceed the limit. The resistance of high-grade filters is greater. When configuring small-size models, you need to check the fan residual pressure more carefully.

For the relationship between filtration level and efficiency, please refer tothe HEPA vs. ULPA air filters page. Rating descriptions on For the configuration points of high-level filters such as U15, please refer toWhat should we pay attention to when configuring U15 filter in EFU? resistance, air volume, sealing and leak detection points .Instructions in

Maintenance path: small size requires more space for disassembly and assembly

After the small-sized EFU is installed in the equipment, the filter needs to be replaced, the fan needs to be inspected, and the cables need to be plugged and unplugged. The box is small and the internal space is tighter, making maintenance actions more likely to be blocked by the structure. When selecting the model, reserve space according to the actual size of the maintenance operation, confirm the direction from which the filter is removed, whether the tool can be inserted, and whether the wiring terminals are accessible.

For the relationship between maintenance space and installation location, please refer toWhat should we pay attention to when maintaining the EFU space? structural, electrical, commissioning and rectification points .Checking methods in

Applicable equipment: Where are the small size models used?

The small size EFU is suitable for locations where the internal space of the equipment is limited but local clean air supply is required. Inside EFEM, precision optical equipment, testing equipment, SMT placement machines and other equipment, there are often critical areas that are compact and regular-sized EFUs cannot fit in, so only small-sized models can be adapted. When selecting a model, first clarify the net dimensions and maintenance conditions of the installation location, and then decide whether to use a small-size or ultra-thin model.

For the configuration method of device-side EFU, 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 For the configuration of EFEM, please refer toHow to choose EFU when using EFEM? Installation space, airflow organization and control linkage method are explained.

Prototype verification: Small-size structures must be tested first before batch production

The small-sized EFU has a compact structure, and new structure or new interface projects should be prototyped or first verified first. The prototype must check assembly interference, air volume, static pressure, power, temperature rise, vibration and noise to confirm that the small size structure does not deviate from the target performance. The prototype data and confirmation drawings are archived together as the basis for inspection of subsequent batches.

In small-size EFU projects, Aili Industries organizes prototypes or first-unit verification according to equipment drawings, files assembly, performance, temperature rise and vibration 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, please refer to the non-standard interface.For the structural description on Customize EFU page.Customization instructions in the

Aili Industrial's small size EFU solution

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The structure, power and filtration conditions of small-size models can be checked according to equipment drawings within the same manufacturing system, without having to transfer parameters between multiple suppliers. For equipment with limited space, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and reduce the size, air volume, heat dissipation and maintenance conditions to the complete machine data that can be verified. Related machines can be referred tothe EFU equipment fan filter unit page, please refer to the compact model.For the structural description on 70mm ultra-thin EFU page.Model description 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. Add space boundaries, air volume and static pressure, heat dissipation conditions, filtering configurations and maintenance paths to the supplementary list, and organize comparisons after the supplier responds. The confirmed small-size model, configuration and interface are used for order execution, and conventional model 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 equipment manufacturers to select small-sized EFUs based on verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to select a model based only on the appearance size, to avoid using the air volume and static pressure data of conventional models, to avoid ignoring the heat dissipation conditions of a small box, to avoid finding that it cannot be removed for maintenance only after it is installed, and to avoid applying small-size models based on conventional filter areas. The core of small-size EFU is not small size, but re-matching fans, filters, heat dissipation and maintenance conditions in a limited space. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the size, performance and maintenance conditions together.

Related questions and answers

Does a thinner profile necessarily mean less air volume?

It cannot be judged only by thickness. The actual capacity depends on the fan, air duct, filter resistance and allowable power.

How to promote small-size 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 size, performance and maintenance conditions together.

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

Prepare current project materials around space boundaries, entrance resistance, heat dissipation, and maintenance paths. 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 a small-size EFU, you can refer to the compact machine and interface supporting instructions provided by Aili Industry by model.

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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 structure, power and filtration conditions of small-size models can be checked according to equipment drawings within the same manufacturing system, without having to transfer parameters between multiple suppliers. The equipment factory completes the prototype and batch production of compact EFU within the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , compact models can be viewed70mm ultra-thin EFU , the entire 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.