How to confirm ULPA grade after process requirements change? Project input and reselection

ULPA filter grade should be re-confirmed based on the new pollution control objectives and system capabilities. After the process requirements change, the You cannot just upgrade the original model by one level without checking the gaseous contamination, materials and air supply conditions. Process changes may come from product upgrades, process adjustments or equipment modifications. The impact of these changes on the filter is not only 'whether the grade is sufficient', but also whether the resistance, air volume, materials and interfaces still match. Just upgrading according to the old plan may solve the particle problem but lead to insufficient air volume or incompatible materials. Aili Industrial covers product lines of different grades, filter materials, structures and sealing forms. The relationship between grade, resistance and system matching can be re-evaluated according to the changed process conditions, allowing complete product dimensions to be compared for re-selection.

1. List the changes: confirm the particles, gas state, layout and operating status respectively.

Distinguish changes in product sensitivity, process dust, equipment layout, personnel operations and gaseous pollution, and explain which goals and acceptance status have changed.

Process changes may be single-dimensional or multi-dimensional. For example, the addition of a process sensitive to molecular pollution is a change in gaseous pollution control requirements; an adjustment in equipment layout is a change in airflow organization; a change in personnel operating methods is a change in dust generation characteristics. Different changes correspond to different coping directions. Aili Industry isHEPA/ULPA filter re-selection communication, the type of change will first be distinguished: changes in particle control targets depend on the level, and changes in gaseous pollution requirements depend on the level.During For chemical filters , changes in the operating environment depend on the filter material and sealing material. The relationship between levels and particle limits can be found inISO cleanliness level comparison。

2. Evaluate the adaptability of the existing system: fan margin and material compatibility should be looked at together

Check the fan margin, air volume distribution, return air and interfaces to determine whether the original filter element can meet the new working conditions, or whether the area and structure need to be adjusted.

Level changes are usually accompanied by resistance changes, and the original fan may have insufficient residual pressure at the target air volume. In terms of materials, if the new working conditions involve higher humidity, corrosive gases or high temperatures, conventional filter media and seals may no longer be suitable. Aili Industry isFFU fan filter unit andIn the EFU equipment end fan filter unit package, the working point can be rechecked according to the changed target air volume and resistance.PTFE HEPA/ULPA filters andProduct lines such as high-temperature resistant high-efficiency filters can respond to the material needs of different working conditions. The relationship between filter resistance and fan matching can be referred toULPA ultra-high efficiency filter FAQ and selection guide。

3. Form a change verification plan: different changes correspond to different confirmation items

List the items that need to be confirmed separately for grade, material and layout changes, retain the old and new conditions and test results, and avoid using old acceptance conclusions to cover new processes.

Grade changes require confirmation of efficiency and resistance, material changes require confirmation of working condition compatibility and sealing status, and layout changes require confirmation of airflow organization and protective boundaries. The three types of changes have different verification items and cannot share the same set of test lists. Aili Industry isNon-standard ULPA filter change items list verification items by change type,ULPA ultra-high-efficiency filters can provide testing data for corresponding models, and the project team can compare the old and new conditions accordingly. For the correlation between change verification and detection reports, please refer toHEPA FAQs and Selection Guide。

4. When adding molecular pollution-sensitive processes, it is not just about increasing the particle level.

When adding new processes that are sensitive to molecular contamination, AMC and material requirements should be discussed, rather than just increasing the ULPA particle rating. ULPA is responsible for particle filtration, and gaseous pollution requires corresponding chemical filtration solutions and material outgassing assessment.

Aili Industrial can simultaneously evaluate particle filtration and gas control needs during process change projects.Chemical filters are configured for target gaseous pollutants,Materials such as PTFE HEPA/ULPA filters can evaluate low outgassing and operating condition adaptability, and the two complement each other rather than replace each other. The division of labor between particulate and gaseous pollution can be referred toULPA ultra-high efficiency filter FAQ and selection guide。

5. Related questions and answers

Is it necessary to use U17 for process upgrade?
There is no such general rule, the choice should be based on the actual target, filtering and system conditions.

The cleanliness of the original system is not up to standard. Can upgrading it to ULPA level solve the problem?
It is also necessary to check the pollution source, bypass and air flow organization. Leveling up is not the answer to all problems.

Can old test reports still be used after process changes?
It cannot be used directly. After the process conditions change, the affected items should be re-confirmed, and the old report only reflects the original working conditions.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

chemical filter

PTFE HEPA/ULPA 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 covers product lines of different grades, filter materials, structures and sealing forms. The relationship between grade, resistance and system matching can be re-evaluated according to the changed process conditions. Corresponding to particle control target changesDifferent efficiency levels of HEPA/ULPA filters respond to changes in gaseous pollution needsChemical filter , material changes in working conditions can be evaluatedPTFE HEPA/ULPA filters andHigh temperature resistant high efficiency filter。FFU fan filter unit andThe fan filter unit at the EFU equipment end can recheck the working point according to the changed target air volume and resistance.Non-standard ULPA filter change items list verification items by change type,ULPA ultra-high efficiency filters provide corresponding model testing data. 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.