How does FFU work? Comprehensive understanding of how FFU achieves clean air supply
FFU, the full name is Fan Filter Unit, which is called fan filter unit in Chinese. It is a clean air equipment that integrates a fan and a high-efficiency filter.
When FFU is running, the fan sucks air into the equipment, and the power generated by the fan pushes the air through high-efficiency filters such as HEPA or ULPA. The filtered air is sent from the air outlet surface into the clean room or inside the equipment.
The basic working process of FFU can be summarized as:
Air suction → fan drive → air delivery → high-efficiency filtration → clean air output
But the actual operation of FFU is not just a simple combination between a fan and a filter.
The parameter matching between motors, fans, filters, internal air ducts, box structures and control systems will all affect the air volume, wind speed, noise and operating status of the FFU.
Therefore, when understanding the working principle of FFU, it is necessary to analyze the entire air treatment process.
Basic workflow of FFU
The air treatment process of FFU can be summarized as:
Ambient air → Air inlet → Fan suction → Fan pressurization → HEPA/ULPA filtration → Clean air output → Clean area
In this process:
The motor is responsible for driving the fan;
Fans are responsible for moving air;
Filters are responsible for filtering out particles in the air;
The control system is responsible for regulating the operating status of the FFU;
The box and internal air ducts are responsible for forming corresponding air flow paths.
These parts together constitute the working system of FFU.
Step 1: Air enters the FFU
After the FFU is running, the surrounding air needs to be sucked into the device first.
According to the structural design of the FFU, air can enter from the corresponding air inlet position of the equipment.
The air entering the FFU may contain particles of different sizes, so it needs to be processed by a high-efficiency filter.
The air inlet structure, fan position and air flow channel inside the FFU will affect the flow state of air after entering the equipment.
If there is large local resistance in the internal structure, it may affect the air flow and operating noise.
Therefore, the structural design of FFU needs to be considered in conjunction with the working conditions of the fan and filter.
Step 2: Motor drives the fan to run
The motor is the power source of the FFU.
After the motor is running, it drives the fan to rotate, and the fan generates corresponding aerodynamic force through rotation, pushing the air to flow toward the filter.
The parameters of the motor and fan will affect the FFU:
Air volume
wind pressure
wind speed
Energy consumption
noise
Speed range
Running status
According to different product designs and application requirements, FFU can adopt different solutions such as AC motor or EC motor.
For clean environments that require long-term operation, the operating efficiency and stability of the motor need to be considered based on specific working conditions.
Step 3: The fan pushes the air through the filter
After the fan generates aerodynamic force, the air continues to flow toward the filter.
The filter also creates a certain amount of resistance while filtering the air.
Therefore, the relationship between the fan's air volume, air pressure and filter resistance needs to be considered when designing FFU.
If the working parameters of the fan do not match the filter resistance, the actual operating air volume may be different from the design requirements.
Therefore, when selecting and designing FFU, it is usually necessary to make judgments based on the actual operating point, rather than just referring to the maximum air volume of the fan.
Step 4: HEPA or ULPA filter the air
The air enters the high-efficiency filter after passing through the fan.
FFU can be configured with HEPA or ULPA filters according to the requirements of clean environments.
The filter filters particles in the air through the filter material structure, and the processed air is output from the outlet side of the filter.
Relevant parameters of the filter include:
These parameters need to match the FFU fan and motor.
Step 5: Clean air output
After the air passes through the filter, it is output from the FFU outlet surface.
Filtered air enters clean rooms, equipment interiors or other target areas.
Different applications have different requirements for outlet air.
Conventional clean environments mainly focus on air filtration and air supply volume.
Applications such as semiconductors and precision electronic manufacturing may also focus on:
Wind speed, airflow uniformity, noise, vibration and installation space.
Therefore, different applications need to select the corresponding FFU configuration according to specific process conditions.
How to control the air volume and speed of FFU?
The air volume and wind speed of FFU are affected by many factors, including:
Motor → Fan → Filter resistance → Air duct structure → Control system
Among them, the motor and fan provide air transportation power, the filter generates system resistance, the air duct affects the air flow path, and the control system can adjust the operating status of the motor.
By changing the motor speed, the operating status of the fan can be adjusted, thereby changing the air volume and wind speed of the FFU.
The actual achievable air volume and wind speed range need to be determined based on the specific motor, fan, filter and overall machine structure.
What does the FFU control system do?
The control system is used to manage the FFU operating status.
For a single FFU, the control system can realize functions such as start, stop and speed adjustment.
For a system composed of multiple FFUs, it can be configured according to project requirements:
The specific control method needs to be determined based on the number of FFU, usage environment and project management requirements.
Why do fans and filters need to be matched?
Filters create resistance as air passes through them.
If the air pressure provided by the fan is insufficient, the actual required air volume may not be achieved.
If the fan size is too large, energy consumption and noise may also increase.
Therefore, FFU design needs to be comprehensively considered:
Fan performance + filter resistance + target air volume + target wind speed
Finalize appropriate working parameters.
This is also a difference in design ideas between FFU and ordinary fan products.
What are the different requirements for FFU in different applications?
Semiconductor applications
Semiconductor and precision manufacturing environments often focus on cleanliness, airflow uniformity, wind speed stability and installation space.
Some equipment requires ultra-thin FFU or EFU structures.
Lithium battery application
Some lithium battery production processes will focus on cleanliness, air volume and wind speed.
Specific parameters need to be determined based on the production process and equipment conditions.
Electronic manufacturing
Electronic manufacturing environments often need to control particulate matter in the air, and some applications also need to consider static electricity control.
Therefore, the corresponding FFU can be configured according to actual requirements.
Automation equipment
The installation space inside placement machines and other automation equipment is usually limited by the equipment structure.
Such applications require product design based on the internal dimensions of the equipment, installation location, air volume and wind speed requirements.
Aili Industrial's FFU core component manufacturing
Aili Industrial's FFU products involve multiple production links, including:
Motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly.
Among them, motors, fans, automatic control systems, sheet metal and filters are all independently developed or produced by Aili Industrial.
This production method allows different parts to be matched uniformly during the FFU development process.
For example:
When the project needs to adjust the wind speed, the parameters of the motor, fan and control system can be adjusted;
When the project has installation height restrictions, structural design can be carried out from the aspects of motors, fans, sheet metal and internal air ducts;
When the project requires special control methods, the system can be configured according to the control requirements;
When the project has special requirements for the filter, the filter resistance can be matched with the power system.
Therefore, Aili Industrial's FFU products can be configured in standard configurations or adjusted according to project parameters.
How does Aili Industrial manufacture an FFU?
FFU complete machine manufacturing involves multiple links.
Aili Industry connects related processes:
Motor→Fan→Control system→Sheet metal structure→Filter→Complete machine assembly→Performance testing
During the product development process, the corresponding configuration is determined based on the customer's installation size, air volume, wind speed, cleanliness requirements and control methods.
For example:
Semiconductor equipment, pay attention to installation space, cleanliness and air flow parameters
Lithium battery application, determine air volume and wind speed according to process requirements
SMT machine, determine the structural size according to the internal space of the equipment
Static electricity sensitive environment, configure relevant materials and electrical solutions according to actual requirements
Special projects, product design according to specific parameters
Aili Industrial FFU production capacity
Aili Industry has a production base of approximately 30,000 square meters, and the production process covers core components and FFU complete machines.
20+
industry experience
About 30,000㎡
production base
The core components are self-produced
motors, fans, control systems, sheet metal, and filters.
Independent research and development
of motors, fans, automatic control system software and hardware
From core components to complete machine assembly, Aili Industrial produces and tests according to the structure and parameters of different FFU products.
Frequently asked questions about how FFU works
What is the basic working principle of FFU?
The FFU uses a motor to drive a fan, sucking air into the device, pushing the air through the HEPA or ULPA filter, and then sending the filtered air into the clean area.
Why does FFU need a fan?
The filter creates resistance to the air, and the fan provides power for the air flow, allowing the air to pass through the filter and form a continuous air supply.
Can the air volume of FFU be adjusted?
Can. According to the motor and control system configuration, FFU can change the fan speed by adjusting the motor operating status, thereby adjusting the air volume and wind speed.
Is the larger the FFU air volume, the better?
no. FFU needs to determine the appropriate air volume and speed based on the actual application. Excessive air volume may increase energy consumption and noise.
Why does FFU need matching filters?
Filter resistance will affect the actual working status of the fan. Therefore, the fan needs to be matched to the filter resistance.
Can FFU be used in semiconductor equipment?
Can. For semiconductor equipment with limited installation space, ultra-thin FFU, EFU or equipment-specific products can be selected based on the installation height, air volume, wind speed and cleanliness requirements.
Can FFU be customized?
Can. Product design can be carried out based on parameters such as installation size, air volume, wind speed, filter, motor, fan, structure and control method.
Need to know about FFU products?
The actual operation of FFU involves multiple links such as motors, fans, filters, control systems and structures.
If you are choosing standard FFU, ultra-thin FFU, high air volume FFU, anti-static FFU or equipment-specific FFU, you can determine the product configuration based on the actual installation space, air volume, wind speed, cleaning requirements and control methods.
Aili Industry can provide corresponding FFU products and technical solutions based on the specific parameters provided by customers.
