How to choose U16 filter for EFU? Efficiency, resistance, sealing and complete machine matching methods

How to choose a U16 filter for EFU? Don’t just look at the filter grade. U16 is a super-efficient grade with higher resistance than H13, H14, and U15, and has stricter requirements for fan residual pressure, sealing structure, and leak detection conditions. Under the same air volume, the initial resistance of the U16 filter rises, and the fan working point shifts toward the direction of small air volume; the seal is not in place, and the ultra-high efficiency filter cannot maintain bypass; the leak detection method does not match, and the sealing status cannot be confirmed after installation. When choosing a U16 filter, efficiency, resistance, sealing, leak detection and overall machine matching should be checked together, instead of just changing the filter level to a higher level. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The efficiency, resistance, sealing and complete machine working point of the U16 filter 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 filter factory, the fan factory and the complete machine factory. This is why many equipment manufacturers will refer to the Aili Industrial configuration instructions when selecting U16 filters for EFU.

Efficiency and standards: The test conditions of U16 must be written clearly

U16 corresponds to the ultra-high efficiency level, but the efficiency level cannot be used alone without testing standards. Procurement should require that the filtration level, testing standards, reporting requirements, and efficiency data for the filter at actual size and rated air volume be included in the technical agreement. Only write 'U16' without writing test conditions. Reports from different suppliers may not be directly comparable. The test particle size and efficiency requirements of U16 are different from those of H13 and H14. When selecting, you must confirm that the test standards correspond to the equipment cleanliness goals.

Aili Industry checks the filter grade and test standards according to the project requirements in the EFU filtration configuration. Please refer to it for purchasing.The grade descriptions on the HEPA and ULPA air filter pages put the efficiency requirements of U16 on the specific model, rather than staying on the grade code.

Rising resistance: fan residual pressure needs to be rechecked

U16 filters generally have higher resistance than H13, H14 and U15. Under the same air volume, both the initial resistance and operating resistance increase, and the fan needs to provide higher static pressure. When configuring the U16 filter, the initial resistance and operating resistance should be placed on the fan curve to see whether the working point corresponding to the target air volume falls within the effective range of the fan. If the residual pressure of the fan is insufficient, the air volume after installation may not meet the equipment cleanliness target; if the residual pressure is too large, the efficiency range deviates, and energy consumption and temperature rise increase.

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 For the analysis method of fan operating point, please refer toHow to choose EFU centrifugal fan? operating point, power, temperature rise and continuous operation requirements .Description of

Air volume matching: Reconfirm according to U16 resistance conditions

After configuring the U16 filter, the target air volume must be reconfirmed according to the new resistance conditions. For the same fan, if the H13 filter or the U16 filter is installed, the working point is different, and the actual air volume is also different. The air volume data under H13 or H14 configuration cannot be used. The air volume of the whole machine must be rechecked based on the initial resistance and operating resistance of the U16 filter. When the equipment end space is compact and the filtration area is limited, the U16 filter has a higher resistance ratio and the air volume must be matched more carefully.

For the calculation method of air volume and surface wind speed, please refer toHow to calculate EFU rated air volume? Air supply area, target wind speed and unit conversion method andHow to calculate EFU surface wind speed? how to determine the effective filtration area and average wind speed .The calculation steps in

Sealing structure: U16 has higher sealing requirements

The U16 filter has a high efficiency rating and higher sealing requirements. If the seal is not in place, unfiltered air bypasses the frame, and the advantages of the ultra-high-efficiency filter cannot be exerted. When configuring a U16 filter, check the flatness of the sealing surface, whether the pressing method is uniform, whether the frame is deformed, and whether the sealing material meets the pressing requirements of the ultra-high efficiency filter. The sealing structure is unreasonable and the bypass cannot be protected no matter how high the level is.

Regarding the relationship between the sealing structure and the whole machine, please refer toHow to confirm EFU installation seal? equipment drawings, installation conditions and acceptance methods . Verification methods in For the key points of installation and leak detection of U15 filter, please refer toWhat should we pay attention to when configuring U15 filter in EFU? the key points of resistance, air volume, sealing and leak detection .Seal check ideas in

Leak detection conditions: The method and judgment standards must match U16

For leak detection of U16 filters, the methods and judgment standards must match the efficiency level. If you use the H13 leak detection method to detect U16 filters, you may not be able to find tiny sealing defects. When configuring the U16 filter, the leak detection method, judgment standard and leak detection location must be agreed in advance. If any abnormality is found during the leak detection, the process shall be followed. Only the appearance inspection is performed, and the sealing status of the U16 filter cannot be confirmed.

In the EFU project, Aili Industries organized installation leak detection according to the equipment drawings and agreed working conditions, and wrote the leak detection methods, judgment standards and exception handling into the confirmation documents. The leak detection requirements of the U16 filter were checked separately. For the leak detection method of U14 filter, please refer toHow to confirm the H14 filter used by EFU? key points of installation, leak detection, replacement and acceptance .Checking ideas in

Replacement and retesting: U16 needs to be retested for leaks after replacement.

After the U16 filter is replaced, in addition to leak detection, the target air volume or wind speed must be re-measured. The resistance of the U16 filter is high. After replacement, the resistance of the new filter is different from that of the old filter, and the fan working point may shift. Replacement records should retain filter model, batch, installation date, leak detection results and retest data. Replacement conditions are judged by pressure difference, not just by time.

Regarding the relationship between filter operating resistance and replacement judgment, please refer toWhat should I do if the operating resistance of the EFU filter increases? pressure difference, air volume and replacement judgment .The troubleshooting ideas in

Match with the whole machine: U16 configuration needs to return to the working point of the whole machine

The configuration of the U16 filter will ultimately return to the working point of the entire machine. After confirming the five items of efficiency, resistance, air volume, sealing, and leak detection, put the complete machine data on the fan curve to confirm that the working points at the initial installation and at the end of operation are within the allowed range. Only confirm the filter level, not the matching of the whole machine. There may be insufficient air volume or high temperature rise after installation. For projects involving speed-regulated operation, please refer toHow to set EFU multi-speed speed adjustment? equipment linkage, abnormal status and acceptance points .Methods for checking gears and working points in

Aili Industrial's EFU filter package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The efficiency, resistance, sealing and leak detection conditions of the U16 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 U16 filter project, Aili Industrial can organize installation leak detection, replacement re-testing and batch curing according to the confirmation diagram, and put the resistance, air volume, sealing and leak detection conditions into verifiable complete machine data. 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

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 efficiency standards, initial resistance and operating resistance, target air volume, sealing method, leak detection method and replacement conditions to the supplementary list, and then organize a comparison after the supplier responds. The confirmed filter model, complete machine configuration and interface are used for order execution. H13 or H14 configuration parameters cannot be used to replace U16 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 U16 filter based on the verifiable complete machine conditions.

Misunderstandings to avoid

It is necessary to avoid using the air volume data of H13, H14 or U15 configurations, to avoid only changing the filter level without checking the fan residual pressure, to avoid installing U16 filters without confirming the sealing structure, to avoid leak detection methods that do not match the efficiency level, and to avoid not re-testing the air volume and sealing after replacement. The core of U16 configuration is not to upgrade the level, but to form a verifiable closed loop of efficiency, resistance, air volume, sealing and leak detection. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the resistance, air volume and leak detection conditions together.

Related questions and answers

Is the higher the filtration efficiency level more suitable for EFU?

uncertain. Increasing the level is often accompanied by changes in resistance and cost, and should be determined by process needs, fan capabilities and verification conditions.

How to promote U16 filter selection for 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, listing the resistance, air volume and leak detection conditions together.

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

Prepare current project information around filtration efficiency, resistance, sealing and leak detection. 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 selecting the U16 filter for EFU, you can refer to the instructions provided by Aili Industry for matching the filter and the complete machine 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 efficiency, resistance, sealing and leak detection conditions of the U16 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 U16 filters and complete machines in the same system, which is easier to maintain data consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , filtering packages 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.