How to choose EFU filter? What is the difference between HEPA and ULPA?

One of the core functions of EFU is:

The processed air is filtered and sent into the equipment or the target clean area.

Therefore, filters are an important part of EFU.

Many customers will ask when choosing EFU:

'Should EFU use HEPA or ULPA?'

'Isn't the higher the filtration efficiency, the better?'

'What is the difference between HEPA and ULPA?'

In fact, the choice of EFU filter cannot be based on just one:

Filtration efficiency.

Also need to consider:

Air volume

resistance

Installation dimensions

Cleanliness requirements

as well as:

Practical application of equipment.

3. What are the main types of EFU filters?

Depending on the cleaning requirements, EFU can be configured with different types of filters.

Common ones include:

HEPA high efficiency filter

as well as:

ULPA ultra high efficiency filter.

The specific one to use needs to be determined based on the actual cleanliness requirements of the equipment.

4. What is a HEPA filter?

HEPA is a type of high-efficiency air filter.

It is mainly used to remove airborne:

Fine particles.

It has applications in clean rooms, electronic manufacturing, semiconductors, medicine and other fields.

For many EFU applications:

HEPA

It has been able to meet the corresponding clean air filtration needs.

5. What is ULPA filter?

ULPA is typically used in environments with higher particle control requirements.

Compared to HEPA:

ULPA filtration efficiency is higher.

But you also need to pay attention to:

As filtration efficiency increases, system resistance may also increase.

Therefore, when using ULPA, you need to reconsider both:

fan

motor

as well as:

System air volume.

6. What is the biggest difference between HEPA and ULPA?

It can be simply understood as:

Need to pay attention to:

It cannot be simply assumed that ULPA is necessarily more suitable for all EFUs than HEPA.

It should be selected according to actual cleaning requirements.

7. Is the higher the filtration efficiency of the EFU filter, the better?

uncertain.

This is a common misunderstanding in EFU filter selection.

If the device actually only needs:

HEPA

Choosing a filter with higher resistance may require a larger:

Fan capacity

To maintain the target air volume.

Therefore the filter needs to match the entire EFU system.

A reasonable choice should be:

Meet cleanliness requirements while maintaining reasonable air volume and system operating status.

8. Why is filter resistance important?

Air creates resistance as it passes through the filter.

It can be simply understood as:

fan ↓ air ↓ filter ↓ generates resistance ↓ clean air

The greater the filter resistance:

The resistance that the fan needs to overcome

will also increase.

Therefore, EFU design cannot only focus on filtration efficiency.

Also need to see:

initial resistance

as well as:

Changes in resistance during use.

9. Will filter resistance affect EFU air volume?

meeting.

When system resistance increases:

The fan operating point may change.

Actual air volume may ultimately be affected.

so:

Filters and fans must match.

Especially when using high filtration grade products such as ULPA, you need to pay more attention to this point.

10. Why does the EFU filter need to be selected together with the fan?

Suppose the customer proposes:

'I need higher filtration efficiency.'

If you only replace the filter without adjusting the fan system, you may:

Improved filtration efficiency

↓

increased resistance

↓

Actual air volume change

Therefore, comprehensive considerations need to be taken into consideration when designing EFU:

filter efficiency

filter resistance

Fan capacity

Target air volume

as well as:

Motor operating status.

11. Is the size of the EFU filter important?

Very important.

Because EFU is usually installed at:

There is limited space inside the device.

Filter size directly affects:

EFU overall size

as well as:

Installation method.

Especially ultra-thin EFU needs to be arranged within a limited height:

motor

fan

filter

and:

Air flow channel.

Therefore, filter size needs to be determined from the early stages of product design.

12. How to design the ultra-thin EFU filter?

One of the biggest features of ultra-thin EFU is:

Installation height is limited.

For example some devices require about:

70mm level

ultra-thin structure.

At this time, the filter not only needs to meet:

Filtering requirements

Also need to meet:

thickness limit

and:

Air volume requirements.

Therefore it is necessary to:

filter

fan

as well as:

air flow channel

Make an overall match.

13. Should HEPA or ULPA be used for EFU of semiconductor equipment?

It cannot be generalized.

Need to be based on:

Equipment process

target cleanliness level

Particle control requirements

as well as:

Equipment internal air requirements

Sure.

If HEPA already meets the actual requirements, there is no need to replace ULPA just to pursue a higher filtration level.

If the equipment has higher requirements for particle control, the ULPA solution can be considered.

14. How to choose EFU filter for photovoltaic equipment?

It needs to be determined according to the specific production equipment and process environment.

Available from:

Cleanliness requirements

Air volume

Filtration efficiency

as well as:

filter resistance

Comprehensive judgment from several aspects.

For local clean air requirements inside the equipment, corresponding filters can be configured according to the actual conditions of the equipment.

15. How to choose EFU filter for lithium battery equipment?

Lithium battery equipment needs to be combined with:

process area

Cleanliness requirements

Air volume

as well as:

Dust control needs

Make a design.

If the equipment requires a higher wind speed and is equipped with a high-efficiency filter, special attention needs to be paid to:

filter resistance

and:

Fan capacity

match between.

16. How to choose the EFU filter for panel display equipment?

The demand for clean air for panel display equipment needs to be determined based on the specific process.

Usually you need to consider:

Particle control

Air volume

wind speed

as well as:

The internal space of the device.

If the equipment space is limited, the filter size also needs to be customized and matched.

17. Can the EFU filter be customized?

Can.

Depending on the project requirements, it can be from:

size

thickness

filter level

frame structure

as well as:

Installation method

etc. to match.

Especially for equipment-side EFU, the filter size often needs to be adjusted according to the equipment structure.

18. Can Aili Industries produce its own EFU filters?

Aili Industrial's production system covers:

filter

as well as:

motor

fan

automatic control system

sheet metal

and:

Complete machine assembly.

Therefore, when designing EFU, the filter can be matched as part of the entire system, instead of selecting a filter separately and then adapting the EFU.

19. Why does Aili Industry emphasize the matching of filters and fans?

Because EFU is a complete system.

For example:

Improved filter efficiency

May bring:

Resistance changes.

Changes in resistance will affect:

Fan operating point.

Therefore, when designing EFU, Aili Industrial will comprehensively consider:

filter

↓

fan

↓

motor

↓

control system

Finally, a solution suitable for the operation requirements of the equipment is formed.

20. What parameters need to be provided for EFU filter selection?

If customers need help from the manufacturer in selecting filters, they can provide:

1. Cleanliness requirements

Such as target cleanliness levels or particle control requirements.

2. Target air volume

How much air supply is required.

3. Target wind speed

What wind speed is required in the equipment process area.

4. Installation space

Filter allows:

length

width

thickness.

5. Usage environment

For example:

semiconductor

photovoltaic

Lithium battery

Panel display

wait.

21. How to judge whether to choose HEPA or ULPA?

You can simply follow the following ideas:

If it is a routine clean air requirement

Consider:

HEPA.

If you have higher requirements for particle control

Consider:

ULPA.

If device space is limited

Need to also consider:

Filter size.

If the target air volume is large

Important things to consider:

Filter resistance and fan capacity.

If it is ultra-thin EFU

Need to do:

Filter+Fan+Motor

Overall match.

22. EFU filter selection should not only focus on filtration efficiency

A truly reasonable EFU filter selection needs to consider both:

Filtration efficiency

resistance

Air volume

size

Usage environment

Replacement method

as well as:

The actual process of the equipment.

Therefore, when purchasing EFU, it is not recommended to only propose:

'I want HEPA.'

Instead, provide the complete:

Cleanliness requirements + air volume + installation space + application scenarios.

23. Aili Industrial EFU filter solution

Aili Industries from:

filter

fan

motor

control system

arrive:

Sheet metal and complete machine assembly

A complete production system has been established.

Therefore, the filter can be configured according to the actual needs of the device-side EFU:

filter level

size

resistance

as well as:

Fan matching

Carry out comprehensive design.

for:

semiconductor

photovoltaic

Lithium battery

Panel display

electronic equipment

For other applications, the EFU filtration solution can be matched according to the specific process and installation space.

24. Frequently Asked Questions

EFU generally uses HEPA or ULPA?

Both can be used, depending on the equipment's cleanliness requirements, air volume and system resistance.

What is the difference between HEPA and ULPA?

ULPA usually has higher filtration efficiency, but it also requires attention to the corresponding filter resistance and system air volume.

Is ULPA definitely better than HEPA?

uncertain. The choice should be based on actual cleanliness requirements, rather than simply pursuing a higher filtration level.

Will EFU filters affect air volume?

meeting. Filter resistance will affect the fan operating point, which may affect the actual air volume.

Can EFU filters be customized?

Can. Can be matched according to equipment installation space, filtration level, size and installation method.

Can ultra-thin EFU use HEPA?

It can be designed according to the specific product structure and filter size, and the thickness, air volume and resistance need to be considered at the same time.

Do semiconductor equipment EFUs have to use ULPA?

uncertain. It needs to be determined according to the specific equipment process and cleanliness requirements.

Can Aili Industrial provide EFU filters?

Can. Aili's industrial production system covers filters, motors, fans, automatic control systems, sheet metal and complete machine assembly, and can be overall matched according to the EFU project.