What is the difference between FFU and EFU? Comparison of application scenarios, structure and selection - Aili Industry

Both FFU and EFU are clean air treatment equipment and are used in scenarios such as semiconductors, electronics manufacturing, clean rooms, and automation equipment.

The basic working methods of both are similar:

The fan provides air power → the air passes through the high-efficiency filter → the filtered air is sent to the target area.

Therefore, when many users come into contact with EFU for the first time, they will have a question:

What is the difference between FFU and EFU?

From the perspective of product functions, both can be used for clean air supply.

However, from the perspective of product positioning and application methods, FFU is usually more used in standard installation environments such as clean room ceilings, while EFU is more inclined to applications inside equipment, local spaces, and installation dimensions are limited.。

Simple understanding:

FFU prefers clean room air supply.

EFU prefers equipment-level clean air supply.

However, the actual selection needs to be determined based on the specific size, air volume, wind speed, cleanliness requirements and installation conditions.

1. What is FFU?

FFU stands for Fan Filter Unit, and Chinese means fan filter unit.

FFU will typically:

Motor + fan + filter + control system + box structure

integrated in one device.

When FFU is running, the fan sucks in air, pushes the air through the HEPA or ULPA filter, and then outputs the filtered air from the air outlet surface.

FFU is common in:

• clean room

• Electronic manufacturing workshop

• Semiconductor factory

• biomedical environment

• laboratory

• Optoelectronics industry

• Lithium battery production environment

One of the more common installation methods is to install it on the ceiling of a clean room or a similar modular clean system.

2. What is EFU?

EFU usually refers to Equipment Fan Filter Unit, that is, equipment fan filter unit。

Compared with FFU, which is mainly used in clean room environments, EFU is more used in local clean environments inside or around production equipment.

For example:

• Semiconductor equipment

• Wafer related equipment

• Automation equipment

• SMT machine

• Precision electronic equipment

• Testing equipment

• Local clean work area

A typical feature of EFU is:

Need to adapt to the installation conditions of the equipment itself.

The internal space of equipment is usually not designed according to standard FFU dimensions.

Therefore, EFU usually needs to be adjusted according to equipment conditions in terms of size, thickness, installation method, air volume, wind speed and control method.

3. What is the main difference between FFU and EFU?

It can be understood from the following aspects.

Things to note here:

FFU and EFU are not simply 'one is good and the other is bad'.

The two are mainly designed for different usage conditions.

4. What scenarios are FFU more suitable for?

FFU is more suitable for clean spaces with a higher degree of standardization.

For example, clean room ceiling systems.

In this scenario, FFUs are arranged according to certain installation modules, and clean air is provided through multiple FFUs.

Common applications include:

Electronic manufacturing workshop

Semiconductor clean room

Optoelectronic production environment

Biomedical clean environment

laboratory

Lithium battery production environment

This type of application usually focuses more on the air treatment effect of the entire clean space.

Therefore, the air volume, wind speed, filter and control method of FFU need to be determined according to the overall clean room plan.

5. What scenarios are EFU more suitable for?

EFU is more commonly used in equipment level clean applications.

For example, inside semiconductor equipment.

The internal space of the equipment is limited, and the structures of different equipment vary greatly.

This means that standard size FFU may not necessarily be directly installable.

At this time, you need to depend on the device:

Installation height

Installation length

Installation width

Air volume

wind speed

Filtering requirements

Control method

Carry out product design.

This is also the reason why EFU products often require structural adjustments.

6. Why do semiconductor equipment often use ultra-thin EFU?

This is where the difference between FFU and EFU applications is more obvious.

Semiconductor devices often incorporate many mechanical, electrical, and process components.

The space available for installing clean air supply equipment may be limited.

If the height of the traditional FFU cannot meet the equipment space requirements, a thinner structure will be needed.

Therefore, device-specific EFU will focus on:

thickness

Air volume

wind speed

airflow uniformity

filter resistance

noise

vibration

and how it is installed inside the device.

For this type of application, product design should not only consider 'whether it can supply air', but also whether it can be installed and whether it meets the equipment operating conditions after installation.。

7. What is the difference between the air volume of FFU and EFU?

Both FFU and EFU can determine the air volume according to actual requirements.

The difference lies in the application conditions they face.

FFU usually serves a larger clean space.

Therefore, the air volume needs to be determined based on the clean room area, cleanliness level, ventilation needs and number of FFU.

EFU may serve the internal space of a device.

Therefore, the air volume needs to be determined based on the internal volume of the equipment, process requirements and local air flow requirements.

so:

It cannot be simply assumed that the air volume of EFU must be smaller than that of FFU.

Actual air volume needs to be determined based on the specific application.

8. What is the difference between the wind speed of FFU and EFU?

Wind speed cannot be judged simply by the product name.

Different applications require different wind speed ranges.

For example:

Semiconductor equipment

There may be more focus on wind speed stability and airflow uniformity.

Lithium battery production equipment

Some processes may focus more on air volume and speed in specific areas.

Ordinary clean room

It is necessary to determine the corresponding air supply parameters according to the overall design of the clean room.

Therefore, both FFU and EFU can be configured for wind speed depending on the specific application.

9. What is the difference between FFU and EFU filters?

Both can be configured with corresponding filters according to cleaning requirements.

Common ones include:

HEPA

ULPA

Which one to use needs to be determined based on the cleanliness level and actual application requirements.

Filter resistance also needs to be considered.

Because the filter resistance will directly affect the fan operating point.

Therefore, filters are not selected independently.

Usually a combination of:

Filter + fan + motor + air volume + wind speed

Make a match.

10. What is the difference between the control methods of FFU and EFU?

Common FFU control methods include:

• Single machine control

• Multi-station group control

• Centralized control

• Communication control

• Wind speed adjustment

For clean room systems, multiple FFUs can be managed through a unified control system.

The EFU may need to cooperate with the control system of the device itself.

For example:

Device starts → EFU starts

Equipment shutdown → EFU stops

Or adjust the EFU operating status according to the internal sensors and process conditions of the equipment.

Therefore, the EFU control system often needs to be designed in conjunction with specific equipment.

11. How to choose between FFU and EFU?

You can simply judge based on the usage scenario.

If it is a clean room ceiling

Prioritize:

FFU

Focus on:

• Cleanliness level

• Air volume

• wind speed

• noise

• Energy consumption

• Control method

• Installation dimensions

If it is installed inside the device

Consider:

EFU

Focus on:

• Installation space

• Equipment structure

• thickness

• Air volume

• wind speed

• filter

• Control method

If the space inside the device is highly restricted

You can further consider:

Ultra-thin EFU

Structural design needs to be carried out according to the installation height that the equipment can provide.

If there are special air volume requirements

Can be based on:

Motor + fan + filter

Perform power matching.

12. Aili Industrial’s FFU and EFU product manufacturing methods

Aili Industry also involves clean air supply products such as FFU and EFU.

Many production links related to the complete product are completed in-house, including:

Motor

fan

Automatic control system software and hardware

sheet metal

filter

Whole machine assembly

This production model allows product design to take into account the parametric relationships between core components.

For example, when the EFU needs to reduce the overall thickness, it not only needs to adjust the sheet metal structure, but also needs to be designed in combination with motors, fans, filters and internal air ducts.

If the equipment has special requirements for air volume and wind speed, the power system can be configured according to the target parameters.

If the equipment requires communication or linkage control, the corresponding control system can be configured according to the equipment control method.

Therefore, Aili Industrial's FFU and EFU products can be based on:

Size + air volume + wind speed + filtration requirements + control method + installation conditions

Perform product configuration and adjustments.

13. Aili Industrial Ultra-thin EFU Application

For applications where the internal installation space of the equipment is limited, Aili Industrial has developed ultra-thin EFU products.

The product structure can be designed according to the equipment installation space.

In some projects, the overall height of EFU can be about 70mm。

The actual product size and performance parameters need to be determined based on the motor, fan, filter and equipment installation conditions.

Ultra-thin structure design is mainly used to solve:

The installation space inside the device is limited

practical problems of this type.

Therefore, when choosing ultra-thin EFU, you can't just focus on the thickness, you also need to confirm at the same time:

Air volume

wind speed

filter resistance

noise

vibration

and how the equipment is installed.

14. FFU and EFU are not substitutes for each other

Although FFU and EFU work in similar principles, their application positioning is not exactly the same.

It can be simply understood as:

FFU: Air treatment for clean spaces

EFU: local clean air supply for equipment

Both can be equipped with high-efficiency filters, both require motors and fans to provide power, and both can be controlled according to requirements.

The difference mainly comes from:

Installation environment and usage requirements.

Therefore, when choosing a product, you should start from the actual application conditions, rather than simply comparing which is better between FFU and EFU.

FFU and EFU FAQs

What is the difference between FFU and EFU?

FFU is mainly used for air supply in clean spaces such as clean rooms, and EFU is mainly used for clean environments inside equipment or local equipment. The working principles of the two are similar, but the installation methods and product structures are usually different.

Is EFU smaller than FFU?

uncertain. The design of EFU usually pays more attention to the equipment installation space, and the size needs to be determined according to the specific equipment.

Is EFU necessarily thinner than FFU?

Not all EFUs have to be ultra-thin. For equipment with limited installation space, ultra-thin structures can be used.

Should semiconductor equipment use FFU or EFU?

It needs to be determined based on the installation location of the equipment and clean air supply requirements. If the product is installed inside a device, it is usually necessary to consider an EFU or device-specific FFU solution.

Can FFU be used inside a device?

Can. Whether it is suitable for use needs to be determined based on the equipment space, size, air volume, wind speed and control method.

Can EFU use HEPA?

Can. According to actual cleanliness requirements, EFU can be configured with HEPA or other corresponding filters.

Can EFU be customized?

Can. EFU usually requires product design based on equipment installation size, air volume, air speed, filters and control methods.

How to choose FFU or EFU?

If you need clean room ceiling air supply, you can focus on FFU products.

If the product needs to be installed inside semiconductor equipment, placement machines, automation equipment or other equipment, you can learn more about EFU or equipment-specific clean air supply solutions.

Aili Industry can be based on:

Installation size, air volume, wind speed, filtration requirements, equipment space and control method

Configure the product.

Learn about Aili Industrial FFU products→

Learn about Aili Industrial EFU products→

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