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Cleanrooms with a clean class of 1000 (according to FS209E standard), 6 (as per the  ISO14644 standard) or above typically use FFU and are installed on ceilings.

They are widely applied in sectors  requiring particularly rigorous air  pollution controls, such as semiconductors, electronics, food, flat panel  displays, and biopharmaceuticals.

①1960s: Before the advent of FFUs, cleanrooms commonly used ducts and  high-efficiency air outlets. 

② 1980s: The FFU technology was invented in the USA and began to appear in  Asia. 

③ ~2000: FFUs gained application and recognition in major industrial nations  worldwide. 

④ ~2009: TKSAGE began producing FFUs and has manufactured over 300,000  units in ten years. 

World's Top Component Suppliers

The performance of FFUs is heavily reliant on the internal fans. TKSAGE utilizes  top-quality domestic and international EC series DC fans as the core components of  FFUs, ensuring stability and consistency of performance. The filters can be customized to utilize fiberglass filter paper or PTFE filter paper, which optimizes the filters’  initial resistance to meet customers' demands for ultra-low energy consumption.

Cooperative partner

As a high-tech enterprise in the field of purification equipment, TKSAGE’s FFUs have earned widespread recognition and application among customers. TKSAGE has delivered comprehensive and  high-quality cleanroom air purification solutions for numerous electronics and pharmaceutical companies.

FFU Structure and Classification

FFU basic parameters

Noise

Noise levels for domestic brand FFUs generally range from 42 to 56 dBA. DC FFUs are typically quieter by  about 1-3 dBA compared to AC FFUs of the same size and specifications.

Vibration

Generally less than 1.0mm/s

Face velocity

The common standard wind speed is 0.45 m/s,  and the rest can be customized

Uniformity

Indicates the consistency of the FFU face velocity, which is determined by the design and manufacturing quality of the fan, filter, and diffuser.

External static pressure

Also known as residual pressure, this parameter is critical for the lifespan of the FFU and is closely  related to the fan. Typically, an external static pressure of at least 90 Pa is required at a face velocity of 0.45 m/s.

Power consumption

AC systems typically range from 100-300 watts, while DC systems range from 50-220 watts. DC  systems consume 30%-50% less power than AC systems.

Technical Features of TKSAGE EC FFU

As customer demands for energy efficiency, noise, and controllability of FFUs increase, the application of EC FFUs is becoming increasingly widespread. In the following section, we will introduce the  performance and technical features of EC FFUs, focusing on the fan, filter, housing, and control  system.

Technical advantages of EC FFU

Active PFC technology

EBM fans can save energy up to 33%, while passive filtering method can only save  4%.

Compensation principle

Active power filters generate harmonic currents with equal amplitude but opposite phase. This ensures that the load current on the supply side is a sine wave. 

Main hazards of harmonics 

Harmonics can cause relay protection and safety automation devices to fail or malfunction. 

They can trigger resonance phenomena, which may result in damage to capacitors and transformers due to overcurrent or overvoltage. Harmonics increase the harmonic losses in power systems. They diminish the efficiency of electrical equipment, causing devices like rotating motors, capacitors, transformers, and conductors (e.g.,  low-voltage neutral lines, cables, bus bars, etc.) to operate under overload conditions (heating, vibration, abnormal noise, etc.), thereby  shortening their lifespan.

"Zero" current startup technology

Figure 1 depicts the startup current diagram of typical AC FFUs  and some domestic DC FFUs. Within 2.5 seconds after startup, a  significant inrush current is generated, which is usually 3.5 times  of the running current. This surge exerts a considerable impact  on the power grid and power switching system. 

TKSAGE PuriFan EC FFU adopts German EBM fan, incorporating  a gradual current discharge function. Upon FFU startup, the  current gradually increases over 12 seconds before reaching the  running current level. This feature effectively safeguards the  power grid and power switch systems.

200V-270V ultra-wide voltage design

After 2004, DC fans integrated rectification and communication modules within the fan, effec-tively becoming a single unit. This change introduced the wide voltage design concept. 

Voltage fluctuations are common in large electronic factories, where the start and stop of large  electrical equipment such as air conditioners, pumps, and boilers can cause voltage fluctua-tions. The 200-270V wide voltage range ensures stable operation of the fans despite grid volt-age fluctuations.

3D impeller design

The company has always been a leader in the industry in terms of impeller design.

The 3D impeller is developed from a simple curved impeller with  appropriate tilt and airflow analysis. The guide strips on the blades  feature patented technology. The angle of tilt and the design of the  guide strips are derived from extensive calculations and experiments. 

Thanks to the 3D impeller, the fan achieves the required air volume  at a lower speed, thereby effectively reducing noise.

Patented "soft" commutation technology, no commutation noise

The patented "soft" commutation technology eliminates commutation noise. DC motors belong to the category of brushless motors.  All brushless DC motors have an electronic commutation circuit,  which eliminates the noise caused by mechanical commutation. 

On this basis, DC fans incorporate patented "soft" commutation  technology, which stabilizes the current during each commutation,  thereby eliminating fluctuations. Particularly at high speeds, this  technology significantly reduces commutation noise. 

The new magnet material produces a homogenous magnetic field  with no ripples, thereby minimizing magnetic field resonance and  noise.

Soft start and soft brake technology

The TKSAGE EC FFU incorporates soft brake/start function. As  shown in the figure, initially, the fan operates in reverse 970  rpm (250Pa off-board pressure). After power on, the fan initi-ates the soft brake program; after 4.2 seconds, it absorbs the  reverse current and the speed drops to reverse 40 rpm, facili-tating a soft landing of rotation speed. Subsequently, it transi-tions into the soft start program, and after 12.2s, the fan speed  gradually increases to forward 1613 rpm and enters the normal  operation.

TKSAGE's Latest AXI-I Control System

1、The upgraded super gateway simplifies installation and is compatible with eLisa 7. 

2、Independent internal data transmission improves feedback speed by over 20 times compared to the original gateway configuration.