How to choose ULPA? Cleaning target, air volume, resistance and installation conditions

The selection of ULPA filters should be based on process cleanliness goals and protection scope, and the configuration should be determined based on air volume, resistance, interfaces, materials and acceptance methods. Higher ratings do not necessarily address airflow and contamination source issues. It is easy to fall into an inertia when selecting ULPA models: choose the grade one level higher, measure the size according to the old parts, and refer to the sample booklet for the air volume, and you are done. But what the selection really needs to answer are four questions: what to protect, how much air volume is needed, whether the system can be pushed, and whether it can be installed. The four questions respectively correspond to the cleaning target, air volume, resistance and installation conditions. If any one is not answered clearly, you will have to rework it later. Aili Industrial has a production base of about 30,000 square meters. The manufacturing system covers motors, fans, control systems, sheet metal, air filters and complete machine assembly. When selecting ULPA, the grade, air volume, static pressure, interface and control can be checked in the same plan, instead of selecting each component separately and then assembling it.

1. Clarify the project input: the cleanliness goal is not 'the higher, the better'

Describe the industry, process, pollutants, operating status, space and air supply boundaries, and distinguish particle requirements from gaseous pollution control requirements.

The first step in model selection is not to select the grade, but to clarify the protection objects and judgment caliber. The efficiency of U15, U16, and U17 increases in sequence, but the applicable scenarios depend on the determined particle size and process sensitivity. If the process is judged based on ≥0.5 μm, H13/H14 may be enough; only when judged based on smaller particle sizes, it is necessary to enter the ULPA grade evaluation. Aili Industry isDuring HEPA/ULPA filter selection communication, the particle size, target air volume and operating status will be confirmed first, and then the gear will be matched, instead of selecting a higher level by default. Chemical contamination requires separate assessmentChemical filters cannot be solved by increasing the particle filtration level. The relationship between levels and particle limits can be found inISO cleanliness level comparison。-1

2. Complete system matching: air volume, resistance and fan operating point must be calculated together

Select the filter element area and model according to the target air volume, and check the fan curve, front-stage filtration, air duct and maintenance space to avoid incoordination after separate selection of each component.

The initial resistance of ULPA is usually in the range of 180-280 Pa, and the final resistance is recommended to be controlled at 2 times the initial pressure difference or no more than 600 Pa. Resistance is not an isolated parameter. It must be viewed together with the fan residual pressure, front-stage filter resistance and air duct resistance. Aili Industrial's product lines cover bothFFU fan filter unit andThe EFU equipment-end fan filter unit , the fan, filter and control system are in the same manufacturing system. When selecting the model, the working point can be checked according to the target air volume and the total system resistance, instead of giving a sample air volume and letting the project party calculate it by themselves. The relationship between ULPA resistance and fan matching can be referred toULPA ultra-high efficiency filter FAQ and selection guide。-1-26

3. Installation conditions determine whether the model can be put on the ground: size, sealing and space must be confirmed simultaneously

The installation conditions are not just 'measure the length, width and height'. The thickness of the outer frame, the position of the sealing surface, the pressing method, the filter replacement space and the accessibility of the detection probe will all affect the model selection. ULPA has various structural forms, including no partition, with partition, liquid tank seal, Mini-Pleat, etc., each with corresponding installation boundaries.-21

Provided by Aili IndustrialTank seal ULPA filter、No partition ULPA ultra high efficiency filter、Various structural forms such as PTFE HEPA/ULPA filters can be matched according to the installation space and sealing method;The non-standard ULPA filter project can provide the equipment opening, installation direction, target air volume and testing space. First confirm the sample fit and then arrange the batch. When the internal space of the equipment is limited, it can be combined withStructural conditions for ultra-thin EFU evaluate filter element size. For the correspondence between installation interface and model selection, please refer toHEPA FAQs and Selection Guide。

4. Include verification as a purchasing condition: reports and leak detection must correspond to the model

Agree on the filtration grade basis, test conditions, installation leak detection and data traceability. Special materials, low outgassing or non-standard interfaces should be confirmed separately.

The last step in selection is to clarify 'how to prove that you have chosen the right one'. Under what air volume the efficiency is measured, what range the leak detection covers, and whether the test report corresponds to the serial number of a single unit, these should be written clearly during the procurement stage. Ai Li industrialULPA ultra-high-efficiency filters can provide test reports that comply with EN 1822 standards. They are scanned for leaks one by one before leaving the factory, and the test data is archived according to serial numbers. The verification method should be agreed upon when selecting the model, and the basis will be available only when the product is accepted, rather than discussing the test conditions after the goods arrive. For the relationship between test reports and selection verification, please refer toULPA ultra-high efficiency filter FAQ and selection guide。-21

5. Related questions and answers

Is it enough to provide only size for inquiry?
Conditions such as target airflow, rating, sealing and environmental conditions should also be provided to enable discussion of actual available configurations.

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. Higher levels are usually accompanied by increased resistance, and the fan residual pressure needs to be checked.

When the airflow in a local protected area is blocked by equipment, can raising the level solve the problem?
cannot. The layout and airflow organization should be dealt with first. Simply upgrading from U15 to U16 will not necessarily improve the performance in this area.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

PTFE HEPA/ULPA high efficiency filter

ULPA ultra high efficiency air 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 has a production base of approximately 30,000 square meters, and its manufacturing system covers motors, fans, control systems, sheet metal, air filters and complete machine assembly. ULPA selection can check the level, air volume, static pressure, interface and control in the same plan:FFU fan filter unit andThe fan filter unit at the EFU equipment end is matched to confirm the working point.HEPA/ULPA filters provide different structural forms and efficiency levels.Tank seal ULPA filter andThe partition-less ULPA ultra-high efficiency filter corresponds to different installation boundaries.Non-standard ULPA filter projects can be confirmed by samples first according to the equipment interface.PTFE HEPA/ULPA filters can evaluate the suitability of filter media under special working conditions. Provide process objectives, installation drawings, operating conditions and acceptance requirements for further communicationULPA ultra-high efficiency filters . Standard specifications, non-standard interfaces, samples and batch matching of The specific parameters and test range are based on the confirmed model and technical documents.