How to choose H13 filter for EFU? Efficiency, resistance, sealing and complete machine matching methods

How to choose an H13 filter for EFU? Don’t just look at the filter level. H13 represents the efficiency level, but after installing the EFU, the actual performance also depends on the initial resistance under the rated air volume, operating resistance, sealing method, leak detection conditions, and whether the EFU fan has enough residual pressure to overcome these resistances. If the filter level is selected high, the resistance will rise, the fan working point will shift, and the air volume may not meet the equipment cleanliness target; if the filter level is selected low, the efficiency will not be enough, and particles cannot be controlled. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. Filter efficiency, resistance and complete machine working points can be checked in the same confirmation data. There is no need to transmit parameters back and forth between filter factories, fan factories and complete machine factories. This is why many equipment manufacturers will give priority to Aili Industrial configuration instructions when selecting EFU H13 filters.

Efficiency and standards: H13 is not the only condition

H13 corresponds to the filter efficiency level, but the efficiency level cannot be used independently from the test standard. 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. If you only write 'H13' without writing test conditions, reports from different suppliers may not be directly comparable.

Aili Industry checks the filter grade and test standards according to 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 down to the specific model, rather than staying on the grade code.

Resistance data: initial resistance and running resistance should be separated

The resistance of the H13 filter directly determines how much static pressure the EFU fan needs to provide. Procurement needs to confirm two resistance values: initial resistance, that is, the resistance of the new filter under rated air volume; operating resistance, that is, the resistance when dust accumulates to the replacement condition. Only given the initial resistance, it is impossible to judge whether the fan can maintain the target air volume during the entire maintenance cycle.

Ai Li industrialEFU products and customized configurations list the filter configuration and complete machine supporting instructions by model. When checking the resistance data when purchasing, you can directly correspond to the specific model, and look at the initial resistance and operating resistance of the filter together with the fan curve of the complete machine.

Sealed construction: bypass risks to be checked individually

No matter how efficient the filter is, if the seal is not in place and unfiltered air bypasses the frame, the actual protection effect will be reduced. Common sealing methods for H13 filters for EFU include gasket compression, liquid tank sealing and knife edge sealing. When purchasing, you should check the flatness of the sealing surface, whether the pressing method is uniform, whether the frame is deformed, and whether the seal can be restored after replacing the filter.

During the assembly of the EFU complete machine, Aili Industrial controls the sealing surface and compression conditions according to the confirmation diagram, and checks the sealing status as part of the complete machine configuration, rather than just confirming the grade of the filter itself. If the seal is unqualified, no matter how high the grade is, the equipment end cleanliness target cannot be maintained.

Leak detection and maintenance: re-test the air volume after replacement

After the H13 filter is installed, a leak test should be arranged to confirm that there is no bypass between the filter and the frame. After replacing the filter, in addition to leak detection, the target air volume or wind speed should also be re-measured to confirm that the resistance of the new filter does not cause the fan operating point to deviate too much. The filter model, batch, installation date and leak detection results should be retained in maintenance records.

When unified management of multiple EFUs is involved, you can compareThe maintenance instructions in EFU Frequently Asked Questions and Technical Support include filter replacement and complete machine retesting in the same maintenance plan, avoiding the need to only replace the filter element on site without retesting the complete machine.

Matching of the whole machine: the filter cannot be selected separately from the fan

The resistance of the H13 filter must match the operating point of the EFU blower. Procurement should require suppliers to provide complete machine data at the target air volume, including fan speed, input power, external static pressure and filter resistance. Only sample data of the filter is given, without matching instructions for the complete machine. It is impossible to judge whether the equipment cleanliness target can be achieved after installation.

In the EFU project, Aili Industrial checked the matching relationship between the filter and the fan according to the equipment drawings and agreed working conditions, and put the filter efficiency, resistance and the working point of the whole machine in the same technical confirmation to reduce the disconnection of component parameters. The equipment factory verifies the filter and the complete machine within the same manufacturing system, which makes it easier to maintain version consistency than transferring parameters among multiple suppliers.

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 unclarified efficiency standards, resistance data, sealing methods and leak detection requirements to the supplementary list, and organize comparisons after the supplier responds. The confirmed filter model, complete machine configuration and interface are used for order execution, and corporate publicity cannot be used to replace this project data. In the EFU supply, Aili Industrial configures the filter and the complete machine according to the confirmation drawing and actual requirements. The materials and components correspond to each item in the order list, which facilitates procurement and makes the selection of H13 filter based on the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid thinking that higher filtration efficiency levels are more suitable for EFU. The increase in grade is often accompanied by an increase in resistance and a change in cost, which should be determined by process needs, fan capacity and verification conditions. If you only write H13 but not the test standards, reports from different suppliers may not be comparable; if you only give the initial resistance but not the operating resistance, you cannot judge the air volume stability during the maintenance cycle; if you only confirm the filter but not the matching of the entire machine, insufficient air volume may occur after installation. Sealing and leak detection cannot be omitted, and the risk of bypass will not disappear automatically because the filter grade is high.

Related questions and answers

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

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

How to promote the selection of H13 filter 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, and list the filters and complete machine conditions together.

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

Prepare current project information around the grades and reports of efficiency and standards, the initial resistance and operating resistance of resistance data, the compression and bypass of the sealing structure, and the matching air volume and residual pressure of the whole machine. The filter test report and the complete machine test record should correspond to the actual purchased model; if the catalog, confirmation drawing and delivery record are inconsistent, the version and applicable scope should be found out first. When selecting H13 filters for EFU, you can refer to the instructions provided by Aili Industry for matching filters and complete machines 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 complete machine assembly. The filter efficiency, resistance and operating point of the whole machine can be checked by model within the same manufacturing system, instead of confirming the unit based on only one filter grade. The equipment factory completes the matching of filters and complete machines in the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , filtering packages 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.