How to design ultra-thin EFU air duct? Compact structure, airflow organization and prototype verification

How to design ultra-thin EFU air duct? You can’t just make the box thin. The air duct is the path of airflow from the air inlet to the air outlet. After high compression, the inlet turns more sharply, the internal flow equalization space is smaller, the conditions on the windward surface of the filter change, and the suction state of the fan changes. If the air duct design is not good, even if it can be installed, the air volume, wind speed distribution and noise may not meet the standards. To design an ultra-thin EFU air duct, it is necessary to re-match the inlet diversion, internal flow equalization, filter area, fan position and air outlet structure within a limited height, and then confirm the airflow organization and overall machine performance through prototype verification. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The structure, airflow and complete machine performance of ultra-thin machine air ducts can be checked according to equipment drawings in the same manufacturing system. There is no need to transfer parameters back and forth between the fan factory, filter factory and sheet metal factory. This is why many equipment manufacturers will refer to Aili Industrial's compact solution instructions when designing ultra-thin EFU air ducts.

Entrance diversion: Turning is sharper after high compression

The first section of the ultra-thin EFU air duct is the entrance. After a high degree of compression, the turn from the air inlet to the internal air duct becomes sharper, and the air flow easily forms vortexes or deflections at the inlet, affecting subsequent filtration and air supply. When designing the inlet guide, it is necessary to confirm the inlet shape, the angle of the guide plate and the distance from the inlet to the filter, so that the airflow can enter the filter surface smoothly instead of being turbulent at the inlet.

Ai Li industrialEFU products and customized configurations list the external dimensions and internal structure descriptions by model. When designing the inlet diversion, the equipment manufacturer can directly correspond to the specific model and compare the inlet shape and internal air duct on the same picture. For the structural description of the ultra-thin model, please refer to70mm ultra-thin EFU page.Model description in the

Internal current balancing: Current balancing is more difficult when the height is small

The second section of the ultra-thin EFU air duct is internal flow equalization. After high compression, the space between the windward side of the filter and the fan becomes smaller, and the airflow enters the filter or fan before it can be evenly distributed, and the surface wind speed distribution may be uneven. When designing internal flow equalization, it is necessary to confirm the position of the flow equalizing plate, the distribution of openings, and the space on the windward side of the filter to make the air flow as uniform as possible before entering the filter.

Regarding the relationship between flow uniformity structure and airflow organization, please refer toWhy does the same air volume produce different cleaning and protection effects? As explained in , the flow equalization design and wind speed distribution are evaluated together.

Filter location: area, sealing and replacement direction

The third section of the ultra-thin EFU air duct is related to the filter. After high compression, the filter area is limited, and the installation direction, sealing method and replacement path must be re-confirmed. The position of the filter affects the length of the air duct and the air flow path. The sealing method is limited by space. The replacement direction must match the box structure. When designing, confirm the position, installation direction and replacement path of the filter in the air duct.

Regarding the relationship between filter area and face wind speed, please refer toHow to calculate EFU surface wind speed? How to determine the effective filtration area and average wind speed . For the verification method of sealing structure, please refer toHow to confirm EFU installation seal? equipment drawings, installation conditions and acceptance methods .Instructions in

Fan location and air outlet: air outlet in a compact space

The fourth section of the ultra-thin EFU air duct is the fan and air outlet. The position of the fan affects the suction conditions and the length of the internal air duct, and the air outlet structure affects the direction and distribution of the air supply. After high compression, the distance between the fan and the filter becomes shorter, and the fan suction may be uneven; the air outlet structure space is limited, making it more difficult to arrange flow diversion and flow equalization. When designing, confirm the fan position, air outlet structure, flow diversion method and air outlet direction.

Regarding the relationship between the fan working point and the air duct, please refer toHow to view the EFU fan performance curve? air volume, static pressure, power and operating point . Interpretation methods in To confirm the direction of the air outlet, please refer toWhat should we pay attention to in the direction of EFU air outlet? Structural, Electrical, Commissioning and Rectification Points .Instructions in

Prototype verification: Ultra-thin air ducts must be tested before batch production

The ultra-thin EFU air duct has a compact structure and should be prototyped or verified first. The prototype should check the air volume, static pressure, wind speed distribution, power, temperature rise, vibration and noise to confirm that the air duct design does not deviate from the target performance. The prototype data and confirmation drawings are archived together as the basis for inspection of subsequent batches. If you skip the prototype and go directly to batch production, air duct problems will be exposed intensively in the batch stage.

In the ultra-thin EFU project, Aili Industries organizes prototypes or first-unit verification according to equipment drawings, files air volume, wind speed distribution, 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 ultra-thin EFU air duct solution

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The structure, airflow and overall machine performance of the ultra-thin air duct can be checked according to the equipment drawings within the same manufacturing system, eliminating the need to transfer parameters between multiple suppliers. For ultra-thin air duct projects, Aili Industrial can organize prototype verification and batch solidification according to the confirmation drawing, and put the inlet diversion, internal flow equalization, filter position and air outlet structure onto the complete machine data that can be verified. Related machines can be referred to70mm 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 the inlet diversion, internal flow equalization, filter position, fan outlet and prototype verification to the supplementary list, and then organize the comparison after the supplier responds. The confirmed air duct structure, complete machine configuration and interfaces 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 factory to design the ultra-thin EFU air duct to the verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to thin the box without redesigning the air duct. It should be avoided to ignore the inlet diversion and cause air flow turbulence. It should be avoided to avoid insufficient internal flow equalization space. It should be avoided to avoid rechecking the filter area after compression. It should be avoided that the distance between the fan and the air outlet is too short to affect the distribution. It should be avoided to skip the prototype and directly batch. The core of the ultra-thin EFU air duct design is not the small height, but the inlet, flow distribution, filter and air outlet structure forming a verifiable airflow path. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the air duct, airflow and prototype 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 ultra-thin EFU air duct design 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 air duct, airflow and prototype conditions together.

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

Prepare current project materials around space boundaries, entrance resistance, thermal 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 designing ultra-thin EFU air ducts, you can refer to the compact complete machine and structural instructions provided by Aili Industries by model.

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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, airflow and overall machine performance of the ultra-thin air duct 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 ultra-thin EFU air ducts in 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.