How to verify ULPA cross-brand replacement? Size, efficiency and drag equivalence

Cross-brand replacementULPA filters should be verified for equivalence of size interfaces, grade basis, air flow resistance, materials and testing requirements. The same nominal rating is not sufficient to prove direct interchangeability. Cross-brand substitution may seem like just changing a supplier, but what is actually required is 'equivalence verification' - whether the new brand's product can achieve the same effect as the original product under the interface, resistance, sealing and testing requirements of the original system. Equivalence does not depend on whether the sample parameters of two products are similar, but on item-by-item verification under the same working conditions. Aili Industrial's product lines cover fiberglass,PTFE HEPA/ULPA filter、Tank seal ULPA filter、Various structural forms such as partition-less ULPA ultra-high-efficiency filters can be used for sample trial installation and performance comparison according to the original system conditions in cross-brand replacement projects, turning equivalence verification from paper comparison to physical verification.

1. First check the mechanical compatibility: outer frame, thickness, sealing form and tolerances

Compare frames, thicknesses, sealing styles, fastenings and tolerances, and consider access space. The same nominal size may correspond to different tank or gasket configurations.

Mechanical compatibility is the first threshold for replacement. The nominal dimensions of the filters of two brands may be the same, but the thickness of the outer frame, the position of the sealing surface, the depth of the liquid tank, or the form of the gasket may be different. They can be installed, but the sealing may not be effective. Aili Industry isIn the HEPA/ULPA filter replacement project, check the size and sealing form one by one according to the original system interface diagram.The tank body and knife edge of the liquid tank seal ULPA filter are matched according to the original equipment interface.Non-standard ULPA filter projects can customize the transition structure according to the original interface when needed. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Compare the performance under the same working conditions: standards, test conditions, resistance and materials should be of the same caliber

Check the filtration standards, test conditions, resistance curves and applicable environments. Do not directly compare the efficiency of one particle size to another MPPS result.

Different brands may use different testing standards and presentation methods, and efficiency values ​​cannot be directly compared. Resistance data must also be meaningful under the same air volume conditions. Aili Industry isDuring the replacement verification of the ULPA ultra-high efficiency filter , efficiency and resistance data under corresponding conditions are provided according to the original standards of the project.The performance data of different filter materials such as PTFE HEPA/ULPA filters are listed according to their respective applicable conditions, and the calibers are unified when comparing. For correspondence between filter selection and test conditions, please refer toHEPA FAQs and Selection Guide。

3. Confirm the installation through samples: air volume, uniformity and integrity must be measured

Check the air volume, uniformity and installation integrity, and update drawings and spare parts information. The actual replacement cannot just use the original brand report.

The sample parameters are correct, and the installation effect needs to be confirmed by actual testing. The filter resistance is different under the fresh air volume, and the original fan working point may be offset; the sealing structure is different, and the integrity after installation needs to be re-checked for leaks. In the cross-brand replacement project, Aili Industry can provide samples according to the original system conditions, and check the air volume, sealing status and integrity after installation.FFU fan filter unit andWhen the EFU equipment-end fan filter unit is matched, the system performance after replacement can be evaluated against the original operating point. For the verification method after replacement, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. When the dimensions match but the initial resistance is higher, the fan operating point must be rechecked.

When the new filter element matches the size but the initial resistance is higher, the fan operating point should be rechecked instead of just adjusting the label model. The increase in initial resistance will shift the working point toward the direction of small air volume, and the original fan may have insufficient residual pressure at the target air volume.

Aili Industry isIn the non-standard ULPA filter replacement project, the original fan curve and the new filter element resistance data can be combined to evaluate the working point, and if necessary, the filter area adjustment or fan speed adjustment can be used to compensate;The FFU computer group control system can record the operating parameters before and after replacement for easy comparison. For the judgment method of working point offset, please refer toFFU FAQ and technical support。

5. Related questions and answers

Does changing the brand require changing the entire system?
Not necessarily. First identify the differences and impacts, and then determine the scope that needs adjustment and re-validation.

Can it be directly replaced if the nominal grade is the same?
cannot. It is also necessary to check the size interface, sealing form, resistance data and test standards. The same nominal grade does not mean that the system is matched.

What should I do if the air volume drops after cross-brand replacement?
The fan working point should be re-checked to confirm whether it is caused by the increased resistance of the new filter element. It can be solved by speed adjustment compensation or configuration adjustment.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

PTFE HEPA/ULPA high efficiency filter

No partition ULPA ultra high efficiency filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industrial's product lines cover fiberglass,PTFE HEPA/ULPA filter、Tank seal ULPA filter、Various structural forms such as partition-less ULPA ultra-high-efficiency filters can be used for sample trial installation and performance comparison according to the original system conditions in cross-brand replacement projects.For HEPA/ULPA filter replacement projects, check the size and sealing form one by one according to the original interface diagram.ULPA ultra-high efficiency filters provide efficiency and resistance data under corresponding conditions according to the original project standards.Non-standard ULPA filter projects can customize the transition structure according to the original interface.FFU fan filter unit andWhen the EFU equipment-side fan filter unit is matched, the system performance after replacement can be evaluated against the original working point.The FFU computer group control system records the operating parameters before and after replacement. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.