What is EFU? Working principle, composition and application of equipment-end fan filter unit

EFU (Equipment Fan Filter Unit) is an equipment-side fan filter unit, mainly used for clean air filtration and air supply inside the equipment or in local areas. EFU usually consists of motor, fan, filter, box and control components, which can be configured according to the equipment installation space, air volume, wind speed, cleanliness requirements and control method.

For production equipment in semiconductor, photovoltaic, lithium battery, panel display, electronic manufacturing and other industries, EFU can be used as an air supply and filtration solution for a local clean air environment inside the equipment.

This article will introduce the definition, working principle, main components, application scenarios, selection factors and the difference between EFU and FFU of EFU.

1. What is EFU?

EFU is the abbreviation of Equipment Fan Filter Unit , which is usually called equipment fan filter unit in Chinese.。

Different from FFU, which is mainly used in clean rooms and clean spaces, EFU is mainly oriented to the inside of the equipment or local areas of the equipment . The air flow is generated by the fan, and the air is filtered by the high-efficiency filter, and then the processed air is sent to the area inside the equipment that needs clean air.

Simply put:

EFU is a fan filter unit installed or integrated on the equipment side to provide filtered air and clean air supply inside the equipment.

EFU is not just a fan, nor a separate HEPA filter, but power, filtration, structure and control .a complete air supply unit that combines

2. How does EFU work?

The basic working process of EFU can be understood as:

Air enters → fan drive → filter filtration → clean air is sent out → enters the inside of the equipment

Its basic structure can be expressed as:

 air inlet ↓ ┌───────────────┐ │ fan │ │ motor drive │ └──────┬──────┘ ↓ ┌───────────────┐ │ HEPA/ULPA │ │ Filter│ └──────┬───────┘ ↓ Clean air delivery↓ Internal area of the equipment

The fan is driven by a motor to form a stable airflow. After the air passes through the corresponding filter, the particles are filtered, and the treated air is then sent into the equipment or a designated area.

The specific air flow direction, air volume and wind speed need to be determined based on the structure of the EFU and the actual use conditions of the equipment.

3. What are the main components of EFU?

A complete set of EFU usually involves multiple core components.

1. Motor

The motor powers the blower.

The power, speed and control method of the motor will affect the operating parameters of the EFU, so it needs to be matched based on conditions such as air volume, air pressure and filter resistance.

2. Fan

Fans are responsible for moving air.

EFU usually needs to select the corresponding fan based on the target air volume, air pressure and filter resistance, so that the power system can meet the air supply requirements of the specific equipment.

3. Filter

The filter is responsible for filtering the air.

According to the cleanliness requirements of the equipment, corresponding high-efficiency filters such as HEPA or ULPA can be configured.

The choice of filter is not only related to filtration efficiency, but also needs to consider parameters such as filter size, air volume and resistance.

4. Box and structural parts

The box is the structural foundation of the EFU, and it also needs to meet the equipment installation space and fixation requirements.

For applications where internal space within the device is limited, the length, width, and height of the EFU may need to be adjusted based on the device structure.

5. Control system

According to the equipment usage requirements, EFU can be configured with corresponding control methods, such as:

• Start/stop control

• Wind speed adjustment

• Running status control

• communication

• Device linkage

The specific control method needs to be determined in conjunction with the control system of the equipment itself.

4. What is the difference between EFU and FFU?

This is a common problem in EFU applications.

Although both EFU and FFU can use the fan + filter working method, their main application scenarios are different.

Therefore, one cannot simply say which one is better, EFU or FFU.

If clean air supply is required inside the equipment or in a local area, EFU is usually more suitable to design based on the installation space and usage conditions of the equipment itself.

5. In which industries is EFU mainly used?

EFU is mainly used in applications that require a clean air environment inside the equipment or in a local area.

Common industries include:

semiconductor

Semiconductor equipment usually has requirements for air parameters such as cleanliness, wind speed stability, and air flow uniformity. EFU can be configured according to the equipment structure and cleanliness requirements.

photovoltaic

Some process areas in photovoltaic production equipment require corresponding clean air environments, and EFU can be configured according to the equipment space and air supply conditions.

Lithium battery

Lithium battery production equipment has different requirements for the local air environment. EFU can configure products based on air volume, wind speed, filters and installation space.

Panel display

Panel display-related production equipment usually has larger equipment structures and different clean areas. EFU can be designed according to the internal space and air supply requirements of the equipment.

Electronic manufacturing

Some areas of electronic manufacturing equipment need to control particulate matter in the air, and EFU can provide filtered air inside the equipment.

SMT machines and automation equipment

For placement machines, automation equipment and precision equipment with limited internal space, EFU can configure the size and parameters according to the installation location and equipment structure.

6. How to choose EFU?

EFU does not only look at one product size.

When actually selecting a model, you usually need to consider the following factors:

1. Installation space

First confirm where the EFU can be installed, including:

Length, width, height, installation location and fixing method.

The overall height of the EFU is particularly important for applications where space within the device is limited.

2. Air volume

Determine the target air volume based on the internal space of the equipment and the actual air supply demand.

3. Wind speed

Different equipment and processes may have different wind speed requirements, which need to be determined based on specific application conditions.

4. Filtering requirements

Choose HEPA, ULPA or other corresponding filtration solutions based on cleanliness requirements.

5. Fans and motors

The motor and fan need to be matched according to air volume, air pressure and filter resistance.

6. Control method

If the EFU needs to operate in conjunction with the equipment control system, control requirements such as start and stop, speed regulation, and communication must also be determined.

Therefore, EFU selection usually needs to consider at the same time:

Installation space + air volume + wind speed + filtration requirements + power system + control method

7. Can EFU be used for ultra-thin structures?

The structural design can be carried out according to the specific equipment space.

The overall thickness of the EFU will be affected by factors such as motors, fans, filters, and internal structural layout. Therefore, ultra-thin design requires comprehensive consideration of the spatial relationship between multiple components.

The height of some EFU products of Aili Industrial can reach about 70mm , which is suitable for applications where the internal installation space of some equipment is limited.

The actual product size still needs to be determined based on the equipment installation space, target air volume, filters and other technical parameters.

8. How does Aili Industrial produce EFU?

Aili Industry has incorporated multiple core production links involved in EFU into its own production system, including:

Motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly.

This production model allows for fit design and parameter matching between different components.

For example, when equipment requires a smaller installation height, you need to consider both:

Motor size → Fan structure → Filter size → Box structure → Control components

Instead of just changing the EFU case size.

For standard EFU products, Aili Industrial can produce them according to established specifications; for projects with special requirements for equipment installation space, air volume, wind speed or control methods, product configuration can be carried out according to actual equipment conditions.

9. Can EFU be customized?

Can.

Customization of EFU typically includes:

• Product size

• Installation method

• Air volume

• wind speed

• fan

• motor

• HEPA/ULPA filter

• Control method

• Communication method

• Device linkage

If there are special space restrictions on the equipment side, it is recommended to provide:

Equipment size, installation location, target air volume or speed, filtration requirements, and control requirements.

If there are equipment drawings or installation location photos, they can also be provided together to facilitate product configuration.

10. Summary: What kind of applications is EFU suitable for?

EFU is mainly oriented to the clean air filtration and air supply needs inside the equipment or in local areas.。

Compared with standardized clean room air supply equipment, EFU usually requires more consideration to the structural conditions of the equipment itself, including:

Installation space, air volume, wind speed, filter, power system and control method.

Therefore, for semiconductors, photovoltaics, lithium batteries, panel displays, electronic manufacturing, placement machines and other precision equipment, EFU can configure corresponding products according to specific equipment conditions.

If you are choosing EFU, it is recommended to first determine the equipment installation space, air volume, air speed and filtration requirements, and then make product selection based on these parameters.

About Aili Industry

Aili Industrial produces FFU, EFU and other clean air equipment. The production system covers motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly.

For equipment-side clean air supply applications, Aili Industrial can configure EFU products based on equipment installation space, air volume, wind speed, filtration requirements and control methods, and provide corresponding manufacturing support for standard products and customized products.

For ultra-thin equipment, semiconductor equipment, lithium battery equipment, photovoltaic equipment, panel display equipment and other equipment-side clean air supply applications, solutions can be communicated based on specific equipment conditions.

FAQ

What does EFU mean?

EFU is the abbreviation of Equipment Fan Filter Unit. It is usually called equipment fan filter unit in Chinese. It is mainly used for clean air filtration and air supply inside the equipment or in local areas.

What is the difference between EFU and FFU?

EFU is mainly used inside the equipment or in local areas, while FFU is mainly used for air filtration and air supply in clean rooms or clean spaces. The application locations and design focuses of the two are different.

Can EFU use HEPA?

Can. According to the cleanliness requirements, the EFU can be configured with corresponding HEPA filters.

Can EFU use ULPA?

ULPA filters can be configured according to specific cleaning requirements and product parameters.

How thin can EFU be made?

The thickness of the EFU needs to be comprehensively designed based on the motor, fan, filter and structure. The height of some EFU products of Aili Industrial can reach about 70mm.