How to design the EFU box? Strength, sealing, air inlet and outlet and maintenance points

How to design the EFU cabinet? You cannot just draw a shell. The box is the basic structure of the whole machine, responsible for the fixation of the fan, filter, and control module, forming an airflow channel, and ensuring sealing, strength, and accessibility for maintenance. When designing the box, the strength, sealing, air inlet and outlet paths, and maintenance space must be considered at the same time. Insufficient strength, operating vibration and tightening force will deform the box; poor sealing, unfiltered air bypass; unreasonable air inlet and outlet paths, affecting resistance and wind speed distribution; insufficient inspection space, and it cannot be disassembled for later maintenance. Ai Li Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The strength, sealing, air inlet and outlet and maintenance conditions of the box 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 sheet metal factory, fan factory and complete machine factory. This is why many equipment manufacturers will refer to the Ai Li Industrial structural plan description when designing EFU cabinets.

Strength: plate thickness, reinforced structure and sealing surface stiffness

Cabinet strength is the basis of design. The thickness of the plate determines the basic stiffness of the box, the reinforced structure (reinforcing ribs, flanges, supports) improves the local stiffness, and the stiffness of the sealing surface affects whether it deforms when pressed. Insufficient strength, the box deforms when the installation is tightened or the vibration occurs during operation, the sealing surface fit becomes worse, and the risk of bypass increases. When designing, the plate thickness and reinforced structure should be determined based on the weight of the entire machine, operating vibration and maintenance load, rather than just the overall dimensions.

Ai Li industrialEFU products and customized configurations list the complete machine structure and supporting instructions by model. The equipment manufacturer can directly correspond to the specific model when designing the box strength, and put the plate thickness, reinforced structure and complete machine weight in the same calculation sheet. Regarding the relationship between load-bearing and support, please refer toWhat should we pay attention to when loading EFU equipment? structural, electrical, commissioning and rectification points .Checking methods in

Sealing: sealing surface, compression method and bypass control

Box sealing is the key to whether the EFU can maintain a clean boundary. The flatness, width and compression method of the sealing surface determine whether there is a bypass between the filter and the box. The sealing surface is uneven, the compression is uneven, and the local compression is not tight; the width of the sealing surface is insufficient, and there is not enough contact surface for the bead or sealant; the compression method is unreasonable, and the box is deformed during tightening. When designing, the width, flatness and compression point distribution of the sealing surface should be determined according to the filter size and compression requirements.

Regarding the relationship between sealing structure and complete machine sealing, please refer toHow to confirm EFU installation seal? equipment drawings, installation conditions and acceptance methods . Verification methods in Filter packages can be viewedHEPA vs. ULPA air filters page.Sealing instructions on

Inlet and outlet wind: path, direction and flow equalization should be designed together

The air inlet and outlet design of the box determines the airflow path and resistance. The position, size and direction of the air inlet affect the inlet resistance; the position and direction of the air outlet affect the air supply coverage; the flow equalization structure inside the box affects the wind speed distribution. During design, the location of the air inlet and outlet should be determined according to the air flow path of the equipment to avoid the air inlet being close to the process exhaust or the air outlet being blocked by the structure. The internal flow sharing structure must be arranged in a limited space and cannot only consider the appearance.

Regarding the relationship between the air inlet and outlet paths and working static pressure, please refer toHow to calculate EFU working static pressure? adding up the resistance of filters, air inlets and equipment air ducts . Calculation method for For the relationship between airflow boundary and protection effect, please refer toWhy does the same air volume produce different cleaning and protection effects? description in .

Maintenance: filters, fans and wiring must be accessible

The cabinet design also needs to consider maintenance. Filters need to be replaced, fans need to be inspected, and cables need to be plugged and unplugged. These actions all require space. When designing the box, it is necessary to reserve access openings and operating space according to the actual size of the maintenance operations, confirm from which direction the filter is removed, whether the fan can be removed separately, and whether the wiring terminals are accessible. There is insufficient space for inspection and maintenance, and subsequent maintenance may require dismantling the entire machine or other parts of the equipment.

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

Materials and surface treatment: choose according to the use environment

The box material and surface treatment should be selected according to the use environment. Standard cold plate spraying is suitable for general equipment environments; stainless steel is suitable for environments with corrosion or high cleaning requirements. Surface treatment affects corrosion resistance and ease of cleaning. The box material, plate thickness, surface treatment and fastener material must be confirmed during design. The corrosion resistance of the material must be checked separately for corrosive environment projects.

For the agreement on the box material grade and certification documents, please refer toHow to agree on the box material grade and supporting documents when purchasing FFU? The verification method in the document corresponds to the material requirements and the use environment.

Sheet Metal Processing: Precision and Consistency Impact Assembly

The accuracy and consistency of box sheet metal processing affects assembly and sealing. The bending angle deviation affects the box shape and sealing surface; the hole position deviation causes misalignment during installation; welding deformation causes the sealing surface to warp. Tolerances must be determined according to the assembly interface during design, and consistency must be controlled during mass production. Sheet metal accuracy is not as high as possible, but is set according to installation and sealing requirements.

Regarding the relationship between sheet metal accuracy and sealing, please refer toHow does the sheet metal processing accuracy of the FFU factory affect ceiling installation and box sealing? The verification method in the method corresponds the machining accuracy to the assembly conditions. For the structural consistency of automatic bending equipment, please refer toFFU manufacturers have automatic bending equipment. What structural consistency indicators should be paid attention to when purchasing? description in .

Prototype verification: After the box design, it must be installed and confirmed

After the cabinet design is completed, it should be verified through prototype or first unit verification. The prototype must be inspected for assembly interference, sealing fit, air inlet and outlet paths, maintenance space and operating vibration. There may be differences between the design drawings and the actual objects, and prototype verification can reveal problems that were not noticed during the drawing stage. The prototype data and confirmation drawings are archived together as the basis for inspection of subsequent batches.

In the EFU project, Aili Industrial organizes the prototype or first unit verification according to the equipment drawings, files the assembly, sealing, airflow and vibration data together with the confirmation drawings, and then solidifies the 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 structure.The structure description on Customize EFU page.Customization instructions in the

Aili Industrial's EFU box design package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The strength, sealing, air inlet and outlet and maintenance conditions of the box can be checked according to the equipment drawings within the same manufacturing system. Sheet metal processing, complete machine assembly and prototype verification do not need to be passed between multiple suppliers. For equipment with clear requirements for the box structure, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and reduce the plate thickness, reinforced structure, sealing surface and maintenance space to the complete machine data that can be verified. Special-shaped box projects can be referred toWhen does the special-shaped EFU box need to be customized? structural boundaries, technical protocols and acceptance points .Description of

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 strength, sealing, air inlet and outlet, maintenance, materials and processing accuracy to the supplementary list, and then organize a comparison after the supplier responds. The confirmed cabinet drawings, complete machine configuration and interfaces are used for order execution, and standard cabinet 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. The cabinet, fan, filter and control correspond to each item in the order list, which facilitates the equipment manufacturer to ensure that the cabinet design meets the verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to only draw the shell without considering the strength and sealing, to avoid not confirming the width of the sealing surface and the pressing method, to avoid conflicts between the position of the air inlet and outlet and the air flow path of the equipment, to avoid not reserving space for maintenance, to avoid mismatching the box material and the use environment, and to avoid sheet metal tolerances deviating from the assembly requirements. The core of EFU box design is not the good-looking appearance, but the strength, sealing, air inlet and outlet, maintenance and processing accuracy to form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the structure, sealing and processing 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 EFU cabinet 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 structure, sealing and processing 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 designing the EFU box, you can refer to the structure and processing instructions provided by Aili Industry by model.

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

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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 strength, sealing, air inlet and outlet and maintenance conditions of the box can be checked according to the equipment drawings within the same manufacturing system. Sheet metal processing, complete machine assembly and prototype verification do not need to be passed between multiple suppliers. The equipment factory completes the cabinet design and complete machine matching within the same system, which is easier to maintain 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 structure can be viewedCustomized EFU , filtering package can be viewedHEPA and ULPA air filters , the control scheme can be viewedDC speed regulating EFU equipment fan filter unit . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.