How to choose ultra-thin EFU filter? Size, effective area, resistance and replacement direction

How to choose an ultra-thin EFU filter? Don’t just look at whether the thickness can fit in. After the filter thickness is compressed, the effective filtration area, resistance, sealing method and replacement direction will change accordingly. The area shrinks, the wind speed increases under the same air volume, and the resistance and noise change; the thickness becomes thinner, and the sealing and compression structure may be limited; if the replacement direction does not match the ultra-thin box, it cannot be removed during maintenance. When choosing an ultra-thin EFU filter, you need to recheck the size, effective area, resistance, sealing and replacement direction in a limited space instead of thinning the conventional filter. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The filter configuration and complete machine working point of ultra-thin models can be checked according to equipment drawings in the same manufacturing system. There is no need to transfer parameters back and forth between the filter factory, fan factory and complete machine factory. This is why many equipment manufacturers will refer to Aili Industrial configuration instructions when selecting ultra-thin EFU filters.

Size matching: thickness, length, width and installation direction should correspond

The first constraint for ultra-thin EFU filters is size. The filter thickness, length, width, installation direction and box opening should correspond. If the thickness is too high, it cannot be installed. If the length and width are not correct, the sealing surface cannot be pressed tightly. If the installation direction is reversed, the sealing structure will fail. When selecting, check the thickness, length and width, frame form and installation direction of the filter according to the box confirmation diagram, rather than purchasing only according to the nominal size.

Ai Li industrialEFU products and customized configurations list the filter size and complete machine matching instructions by model. When checking size matching, the equipment manufacturer can directly correspond to the specific model and put the filter size and box confirmation diagram on the same picture for comparison. For the structural description of the ultra-thin model, please refer to70mm ultra-thin EFU page.Model description in the

Effective area: The area will change after thickness compression

The effective filtration area of ​​ultra-thin EFU filters is usually smaller than that of conventional thickness filters. Under the same air volume, the area shrinks, the face wind speed increases, and the resistance and noise change. When selecting, recheck the effective area of ​​the filter and the target surface wind speed to confirm that the wind speed does not exceed the allowable range under the target air volume. If only the area of ​​the conventional filter is applied, the surface wind speed may be too high or the resistance may exceed the limit.

For the calculation method of face wind speed, please refer toHow to calculate EFU surface wind speed? For the steps in How to Determine the Effective Filtration Area and Average Wind Speed , check the ultra-thin filter area and face wind speed under the same caliber. For the relationship between air volume and area, please refer toHow to calculate EFU rated air volume? air supply area, target wind speed and unit conversion method .Calculation method of

Resistance: Thin filters may have higher resistance

The resistance of ultra-thin EFU filters cannot be directly used from the data of conventional thickness filters. After the thickness is compressed, the pleat height and area of ​​the filter material change, and the initial resistance and running resistance may be different. Under the same air volume, the area shrinks, the surface wind speed increases, and the resistance increases; the structure of the filter material changes, and the resistance curve is also different. When selecting, check the actual resistance data of the ultra-thin filter, put the initial resistance and operating resistance on the fan curve, and confirm that the fan residual pressure is sufficient.

For confirmation methods of filter initial resistance and operating resistance, please refer toHow to confirm the initial resistance of EFU filter? rated air volume, test conditions and fan matching . Verification steps for Filter packages can be viewedthe HEPA vs. ULPA air filters page.Rating descriptions on

Sealing method: The compression structure in the thin box must be confirmed

The sealing method of the ultra-thin EFU filter is limited by the box space. A compression structure of conventional thickness may not fit in a thin box, and a more compact sealing form needs to be used instead. When selecting, confirm whether the sealing method, compression structure and frame form match the ultra-thin box. If the sealing pressure is not tight and unfiltered air is bypassed, the filter efficiency cannot be maintained no matter how high it is.

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

Replacement direction: ultra-thin cabinets should leave disassembly and assembly paths

The replacement direction of the ultra-thin EFU filter is an item that is easily overlooked when selecting a filter. The box is thin, so the direction from which the filter can be removed, whether tools can be inserted, and where to put it after removal should all be confirmed before selection. The replacement direction does not match the box structure, and the EFU or other parts of the equipment may need to be disassembled during maintenance. Ultra-thin models often have bottom-detachable or side-detachable structures. When selecting models, confirm the replacement direction and maintenance space.

For the relationship between maintenance space and replacement direction, please refer toWhat should we pay attention to when maintaining the EFU space? structural, electrical, commissioning and rectification points . Checking methods in Please refer to the key points for customizing the detachable structure.When does a knock-down EFU need to be customized? structural boundaries, technical protocols and acceptance points .Description of

Match with the whole machine: the working point should be reviewed after the filter is changed to thinner

After the ultra-thin EFU filter is replaced, the working point of the entire machine must be rechecked. As the filter resistance changes, the fan working point shifts, and the air volume and power change accordingly. When selecting, the initial resistance and operating resistance of the ultra-thin filter should be placed on the fan curve to confirm that the operating point corresponding to the target air volume is still within the effective range of the fan. Only confirm that the filter can be installed, but do not confirm that the whole machine matches. There may be insufficient air volume or high temperature rise after installation.

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 .Checking methods for

Aili Industrial's EFU filter package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The size, area, resistance and replacement direction of the ultra-thin EFU filter can be checked according to the equipment drawings within the same manufacturing system. The filter size, box structure and complete machine working point do not need to be transferred between multiple suppliers. For the ultra-thin filter project, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and put the size, area, resistance and replacement direction into verifiable complete machine data. 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 the filter size, effective area, initial resistance and running resistance, sealing method, replacement direction and complete machine working point to the supplementary list, and then organize the comparison after the supplier responds. The confirmed filter model, complete machine configuration and interface are used for order execution, and regular filter parameters cannot be used to replace ultra-thin data. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. The filter, fan and box correspond one by one according to the order list, which facilitates the equipment manufacturer to select the ultra-thin EFU filter based on the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid selecting filters based solely on thickness. You should avoid using the effective area of ​​conventional filters to apply ultra-thin models. You should avoid looking at the initial resistance but not the running resistance. You should avoid ignoring the sealing and compression structure of the thin box. You should avoid changing the direction that conflicts with the box structure. You should avoid only confirming that the filter can be installed without confirming that the whole machine matches. The core of the ultra-thin EFU filter is not its thin thickness, but its size, area, resistance, sealing and replacement direction that can form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the size, area and replacement 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 filter 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, area and replacement 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 selecting ultra-thin EFU filters, you can refer to the instructions provided by Aili Industry for matching filters and complete machines 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 size, area, resistance and replacement direction of the ultra-thin EFU filter can be checked according to the equipment drawings within the same manufacturing system. The filter size, box structure and complete machine working point do not need to be transferred between multiple suppliers. The equipment factory completes the matching of ultra-thin filters and complete machines in the same system, which makes it easier to maintain data consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , compact models can be viewed70mm ultra-thin EFU , filter package can be viewedHEPA and ULPA air filters , the overall structure can be viewedEFU equipment fan filter unit , non-standard interface can be viewedCustom EFU . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.