When does a knock-down EFU need to be customized? Structural boundaries, technical protocols and acceptance points

When does a drop-down EFU need to be customized? It cannot just be because 'you want to change the filter from below.' The characteristic of the down-mounted EFU is that the filter can be disassembled and installed from below. It is suitable for equipment that has no maintenance space above the installation location and can only be operated from below. However, dismantling the structure will change the internal layout, sealing and compression methods and maintenance routes of the box, which may not be directly satisfied by standard boxes. Signals that need to be customized include: there is no maintenance space above the equipment installation location, there is an operating channel below, the filter size or shape is special, and other components cannot be disassembled during maintenance. To customize the knock-down EFU, you must first freeze the equipment boundaries and acceptance conditions, and then decide the box structure, disassembly and assembly direction, sealing method and control interface, instead of first making a knock-down appearance and then improving the performance. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The structure, sealing and complete machine performance of the down-mounted EFU 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 Aili Industrial structural plan description when judging whether to customize the down-mounted EFU.

When does it need to be customized: first look at the maintenance direction and space

To determine whether a detachable EFU is needed, first look at the maintenance direction and space. The upper part of the equipment installation position is blocked by the structure and there is no maintenance space. The filter can only be disassembled and installed from below, and the structure needs to be removed. A standard box may be simpler if there is maintenance space above or to the sides. The detachable EFU is not suitable for all compact spaces. It depends on whether there is an operating channel underneath, whether tools can be inserted in, and where to put the removed filter.

Ai Li industrialEFU products and customized configurations list the standard box structure and installation interface by model. When the equipment manufacturer determines whether it needs to be dismantled and customized, it can directly correspond to the specific model and compare the maintenance direction and standard scope in the same comparison table.

Structural boundaries: disassembly and assembly directions and internal layout should be frozen

Once you've decided to customize, the first step is to freeze the structure boundaries. When the filter is disassembled and assembled from below, the internal layout of the box must be adjusted accordingly: the filter installation position, compression structure, sealing surface, and operating space below must all be confirmed before design. The direction of disassembly and assembly is uncertain, and the internal layout of the box has been repeatedly changed; there is insufficient operating space below, and the filter cannot be removed; the pressing structure is unreasonable, and the seal cannot be restored after removal.

In the dismountable EFU project, Aili Industrial froze the structural boundaries according to the equipment drawings, and wrote the disassembly and assembly direction, the space below and the internal layout into the confirmation drawing to avoid subsequent repeated modifications.

Technical agreement: performance, disassembly, assembly and acceptance must be clearly written

The technical agreement for the dismountable EFU must clearly state the performance parameters, disassembly and assembly requirements, and acceptance methods. Performance includes target air volume, external static pressure, filter level and resistance; disassembly and assembly requirements include disassembly and assembly direction, required tools, and seal recovery methods; acceptance includes prototype verification items, batch inspection items and judgment basis. The technical agreement was written in a general way, and it was only after the prototype was made that it was discovered that disassembly and assembly were difficult or the seal could not be restored, making modifications more expensive.

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 bases the performance parameters in the technical agreement on the operating conditions of the whole machine.

Sealing structure: the seal must be restored after removal

The sealing structure of the detachable EFU is the focus of customization. The filter is disassembled and assembled from below. After disassembly and assembly, the sealing surface must be able to be re-pressed, and the sealing failure cannot be caused by disassembly. When designing, confirm the sealing method, compression structure and recovery method after disassembly and assembly. The compression structure is unreliable and the seal cannot be restored after removal, increasing the risk of bypass.

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 . Checking methods in Filter packages can be viewedHEPA vs. ULPA air filters page.Sealing instructions on

Prototype verification: the disassembly structure must be tested for disassembly and sealing first

The detachable EFU is a new structure, so it is advisable to make a prototype or the first unit for verification first. For the prototype, check whether the filter can be removed smoothly, whether the operating space below is sufficient, whether the seal can be restored after disassembly and assembly, and whether the air volume and static pressure meet the standards. Disassembly and assembly verification must be carried out under actual installation conditions, not just static dimensions. The prototype data and confirmation drawings are archived together as the basis for inspection of subsequent batches.

In the disassembly EFU project, Aili Industrial organizes the prototype or first unit verification according to the equipment drawings, files the disassembly, sealing, performance data and confirmation drawings together, 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

Key points for acceptance: disassembly, sealing and performance must correspond

The acceptance of the detachable EFU must match the disassembly, sealing and performance. The disassembly and assembly acceptance checks to see whether the filter can be removed smoothly and whether the operating space is sufficient; the sealing acceptance checks to see whether the seal can be restored after disassembly and assembly, and whether the leakage test passes; the performance acceptance checks to see whether the air volume, static pressure, and power are up to standard. If the three items do not correspond, the acceptance conclusion will be incomplete.

In the disassembly EFU project, Aili Industry organizes acceptance according to the confirmation drawing and technical agreement, and maps the disassembly, sealing and performance to the specific model and batch. For projects delivered in batches, please refer toWhich batch of equipment should the random spare parts of the EFU batch project be delivered with? The batch management idea in the paper corresponds to filter spare parts and equipment batches.

Aili Industrial's detachable EFU solution

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The structure, sealing and overall machine performance of the drop-down EFU can be checked according to the equipment drawings within the same manufacturing system, and box processing, filter matching and complete machine assembly do not need to be passed between multiple suppliers. For projects with limited disassembly or maintenance directions, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and put the disassembly and assembly directions, seal restoration and interface conditions into verifiable complete machine data. 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

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 maintenance direction, space below, internal layout, sealing structure, technical protocol and prototype verification to the supplementary list, and then organize the comparison after the supplier responds. The confirmed cabinet drawings, complete machine configuration and interfaces are used for order execution, and standard model parameters cannot be used to replace this project data. Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements during EFU supply. The box, fan, filter and control correspond to each item in the order list, which facilitates the equipment factory to customize the detachable EFU to the verifiable complete machine conditions.

Misunderstandings to avoid

Disassembly and customization should be avoided when there is a maintenance space above the standard box. Disassembly and assembly design should be avoided before the structural boundary is frozen. Sealing cannot be restored after disassembly. Technical agreements should be avoided to only include performance but not disassembly and assembly requirements. Skipping prototypes and going directly to batches should be avoided. The core of the customization of the bottom-down EFU is not the special direction of disassembly and assembly, but that disassembly, sealing, performance and acceptance can form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, and list the disassembly, sealing and acceptance conditions together.

Related questions and answers

Can non-standard EFU skip the prototype and go directly to batch production?

For new structure or new interface projects, it is recommended to verify the prototype or the first unit first, and then solidify the batch configuration after confirming the performance and assembly.

How to promote the customization of drop-down EFU 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, and list the disassembly, sealing and acceptance conditions together.

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

Prepare current project materials around confirmation diagrams, performance conditions, prototype verification and version solidification. 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 customizing the detachable EFU, you can refer to the structure and performance supporting instructions provided by Aili Industrial according to the 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, sealing and overall machine performance of the drop-down EFU can be checked according to the equipment drawings within the same manufacturing system, and box processing, filter matching and complete machine assembly do not need to be passed between multiple suppliers. The equipment factory completes the prototype and batch production of the drop-down EFU 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 customization 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.