Number of views: 3601 Author: Aili Industry Release time: 2026-08-12 Source: This site
EFU (Equipment Fan Filter Unit) is an equipment-side fan filter unit used for clean air filtration and air supply inside the equipment or in a local area.
It uses a motor to drive a fan to generate airflow. After the air is filtered by the filter, it is sent into the interior of the equipment or a designated area at a certain air volume and speed , thereby providing the equipment with a corresponding local clean air environment.
The work of the EFU is not just 'fan blowing', but the motor, fan, filter, box structure and control system . is completed by The matching between different components will directly affect the air volume, wind speed, wind pressure, noise and operating status of the EFU.
The basic working process of EFU can be simply understood as:
Air enters → fan drive → air passes through the filter → clean air is sent out → enters the inside of the equipment
It can be expressed as:
air entering ↓ ┌─────────────┐ │ Motor + fan │ │ generating air flow │ └──────┬──────┘ ↓ ┌───────────────┐ │ HEPA / ULPA │ │ Filter│ └──────┬──────┘ ↓ Clean air delivery↓ Internal area of the equipmentThe fan is responsible for promoting air flow, the filter is responsible for filtering particles in the air, and the control system can control the operating status of the EFU according to equipment requirements.
The structure and air inlet and outlet methods of different EFU products may be different, but the basic airflow process can be divided into several stages.
The EFU first needs to get air inside the device.
The air can come from circulating air within the unit or other sources depending on the system design.
The specific method of entering the air depends on the EFU structure and the air system of the device itself.
After the air enters, the fan creates a pressure difference and pushes the air to flow.
The fan is driven by an electric motor.
therefore:
The motor provides the power and the fan is responsible for pushing the air.
The operating parameters of the fan will affect the air volume, air pressure and operating status of the EFU.
The air pushed by the fan passes through high-efficiency filters such as HEPA and ULPA.
The filter filters particles in the air so that the treated air meets the corresponding clean requirements.
The filtered air is sent out from the EFU outlet side, forming a corresponding local airflow environment according to the equipment structure.
The motor is an important part of the EFU power system.
The motor is responsible for driving the fan.
The power, speed and control method of the motor will affect:
Fan speed
power
Air volume
wind pressure
Speed regulation method
Energy consumption
Running status
Therefore, EFU selection cannot only look at motor power, but needs to be combined with:
Fan + motor + filter resistance + target air volume
Comprehensive matching.
Fans are responsible for moving air.
When the EFU is actually running, the fan needs to overcome the resistance in the filter, internal structure, and system to make the air reach the target air volume.
Therefore EFU needs to pay attention to both:
Air volume and pressure.
If you only focus on the air volume without considering the filter resistance and actual system resistance, the actual operating parameters may be different from the theoretical parameters.
Filters are an important part of EFU clean air treatment.
Common filtering solutions include:
HEPA
ULPA
Different filters have different filtration performance and resistance characteristics.
When choosing a filter, you need to consider:
Cleanliness requirements
Filtration efficiency
Air volume
wind pressure
filter size
Installation space
Usage environment
Therefore, the filter, fan and motor need to be properly matched.
The filter itself creates some resistance.
As air passes through the filter, the fan needs to provide enough pressure to overcome these resistances.
It can be simply understood as:
Fan capacity → overcome system resistance → air passes through filter → achieve target air volume
Therefore, if the filter resistance changes, the actual EFU operating point may also change.
This is why the EFU design cannot only determine one fan model, but needs to comprehensively consider the entire system.
Many people tend to confuse air volume and wind speed when choosing EFU.
Air volume represents the volume of air passing through per unit time, and is usually used to determine how much air the EFU can provide.
Wind speed represents the speed of air movement. For equipment-side applications, wind speed may directly affect the airflow state in a local area.
therefore:
Air volume and wind speed are not the same parameters.
In actual application, it needs to be comprehensively determined based on the equipment structure, air supply area and process requirements.
For some precision equipment, just 'wind' does not mean that the air flow meets the requirements.
If there is an obvious difference in wind speed in the air outlet area, it may lead to different air conditions in local areas.
Therefore, some applications require attention:
Wind speed stability
airflow uniformity
Outlet distribution
Especially in semiconductor, panel display, photovoltaic and other precision manufacturing equipment, the airflow design of EFU needs to be considered in conjunction with the actual process area.
EFU can configure the corresponding control system according to the equipment requirements.
Common control functions include:
Start/stop control
Wind speed adjustment
Running status control
communication
Device linkage
For example:
Equipment control system → EFU control → Motor operation → Fan rotation → Air filtration → Clean air delivery
If the EFU needs to be linked with the equipment, the control interface and communication requirements need to be determined during the product design stage.
Space inside equipment is often limited.
There may be both:
Process module
Electrical components
Mechanical structure
pipeline
sensor
Other functional modules
Therefore, the installation space left for EFU may be very limited.
At this time, the height of the EFU becomes an important parameter.
The height of some EFU products of Aili Industrial can reach about 70mm , which can be used in applications where the internal installation space of some equipment is limited.
It should be noted that the EFU thickness cannot be achieved by reducing the cabinet alone. It also needs to be considered at the same time:
Motor size, fan construction, filter thickness, internal airflow paths, and control component layout.
The performance of the EFU is not determined by any one component alone.
Aili industrial production system covers:
Motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly.
Therefore, when configuring EFU products, the relationship between multiple components can be comprehensively considered.
For example:
Target air volume → Fan matching → Motor matching → Filter matching → Structural design → Control system
For ultra-thin products, further considerations are needed:
Installation height → Motor and fan layout → Filter size → Air flow channel → Overall machine structure
Usually you need to focus on:
Cleanliness, wind speed, air flow uniformity, installation space
Usually a combination of:
Cleaning requirements, air volume, wind speed and equipment structure
You can focus on:
Air volume, wind speed, filtration requirements and internal space of the equipment
Usually it is necessary to consider comprehensively:
Cleanliness, airflow distribution, air volume, wind speed and installation space
Usually more attention is paid to:
Product size, installation method, air volume, wind speed and equipment linkage
The EFU uses a motor to drive a fan to generate airflow, so that after the air passes through HEPA, ULPA and other filters, it is sent into the interior of the equipment or a local area at a set air volume and speed, thereby providing a corresponding clean air environment.
The main factors affecting the actual operating status of the EFU include:
Motor, fan, filter, air volume, wind pressure, wind speed, air flow structure and control system.
An EFU needs to solve not only filtering problems, but also needs to consider:
Power question:
How to match the motor and fan?
Filtering Questions
What filter to choose?
Space issues:
How big can the equipment be installed inside?
with airflow issues ?
How to achieve target air volume and speed
Does the control issue
need to be linked to the equipment?
Therefore, for device-side EFU, product design usually needs to be considered from the overall system.
If your device has the following requirements:
Clean air is needed inside the equipment
Some areas require filtered air supply
Installation space is limited
There are requirements for air volume
There are requirements for wind speed
Requires HEPA or ULPA filtration
Need to be linked with equipment control system
Then you can further consider the EFU solution.
When selecting, you can prepare:
Equipment name, installation space, target air volume, target air speed, filtration requirements, and control method.
If there are equipment drawings or installation location photos, they can also be used as a reference for product configuration.
Aili Industrial produces EFU, FFU and other clean air equipment. The production process covers motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly.。
For EFU products, motors, fans, filters, structures and control systems can be matched according to the actual needs of the equipment.
For applications where the internal space of the equipment is limited and there are special requirements for air volume or wind speed, the product can also be configured according to the actual installation conditions.
For example:
Ultra-thin EFU, high air volume EFU, equipment customized EFU
As well as EFU applications for semiconductor, photovoltaic, lithium battery, panel display, electronic manufacturing and other equipment.
The EFU drives the fan through the motor, causing the air to pass through filters such as HEPA or ULPA, and then sends the filtered air into the interior of the equipment or a local area at the corresponding air volume and speed.
EFU usually consists of motor, fan, filter, box and control components.
no the same. Air volume represents the volume of air passing per unit time, and wind speed represents the speed of air movement. The two are different parameters.
meeting. The filter will produce a certain resistance, so the fan and motor need to be matched according to the filter resistance.
Corresponding speed regulation and control methods can be configured according to product and equipment requirements.
Control methods such as start and stop, speed regulation, communication and linkage can be configured according to equipment requirements.
