Fan Filter Unit is a ceiling-mounted unit equipped with a fan, used in turbulent flow and laminar flow cleanroom. The overall design of the unit is flexible. According to the design specifications, it can be easily matched with any ceiling frame to achieve the cleanliness level 1000 to level 1. With this unit, high-quality air can be delivered to the cleanroom. It is suitable for semiconductor, electronics, flat panel display and disk drive manufacturers, optics, biological industries and other industries. It is used in cleanroom, clean work benches, clean production lines, clean sheds and local 100-level cleanness occasions and other places.