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The fan filter unit is a ceiling unit equipped with a fan, used in turbulent and laminar flow clean rooms. The unit is designed to be flexible as a whole. According to the design specifications, it can be easily matched with any ceiling frame to achieve a cleanliness level of 1000 To level 1 requirement. The fan filter unit is one of the quietest and most cost-effective units on the clean market. With this unit, high-quality air can be delivered to the clean room. Moreover, the air flow shape is good. It is suitable for semiconductor, electronics, flat panel display and disk drive manufacturers, optics, biological industries and other industries. It is used in clean rooms, clean workbenches, clean production lines, clean sheds and local 100-level occasions and other applications. Where there are strict control requirements for pollution in the air, energy saving and consumption reduction can be achieved, and operating costs can be reduced.