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Many cosmetic cleanroom utilize a device called an FFU (Fan Filter Unit), which effectively filters dust and bacteria. However, proper control is essential. So, why do we need to control FFU (Fan Filter Unit)?

Currently, FFU (Fan Filter Unit) generally use single-phase multi-speed AC motors, three-phase multi-speed AC motors, and brushless DC motors. The motor power supply system operates at approximately 110V, 380V, 270V, and 220V. Control methods mainly include: multi-speed switch control; continuous speed adjustment control; computer control; and remote control. Most FFU (Fan Filter Unit) are made of imported environmentally friendly aluminum-zinc coated steel plates, ensuring rust and corrosion resistance, making them particularly suitable for use in cosmetic cleanroom.

If the ceiling of the cosmetic cleanroom is divided into several control modules, choosing FFU (Fan Filter Unit) is even better. In this environment, FFU (Fan Filter Unit) can maintain optimal airflow balance and reduce the height requirements for the plenum. From the components of the FFU, only the small centrifugal fan consumes energy, and the power of the small centrifugal fan is generally between 15W and 190W. Although the initial investment in using FFU (Fan Filter Unit) is higher than using ducted ventilation, it demonstrates significant energy savings and maintenance-free characteristics in later operation.

FFU motors use DC/EC (electronic commutator motors), saving nearly 50% of energy compared to traditional AC motors. This is because small fans typically use small-volume (power < 1/2 HP) AC motors, which are usually capacitor-split or shaded-pole types, with an efficiency of only about 40%, while DC/EC motors have an efficiency of 75% to 80%.  Variable speed control can be implemented independently for each unit based on filter pressure drop to save energy, but currently, the internal rate of return is still long, so it is not widely adopted. Commonly used methods include group control or overall group control. Generally, the most economical and effective control method is selected based on the control method of the central air conditioning system in the cleanroom, the total number of FFU (Fan Filter Unit) in the cleanroom, and the client's requirements for the FFU (Fan Filter Unit) control system.

Considering the requirements for air cleanliness levels in the cleanroom and the temperature and humidity requirements of the cleanroom environment for the production process, selecting an FFU (Fan Filter Unit) system is only the beginning of a project.