Fan Filter Unit is a core element to supply clean air by purifying air while it is an automatic filtering device primarily used to prevent dust creation or influx into lab or clean room.
FFU is made on beneath ceiling (upper side of clean room) for system ceiling, and tray and sub duct are installed to connect FFU panel and then communication line and power is connected to FFU panel.
Therefore, FFU filters air from ceiling (system ceiling) and sent filtered air to clean room and other places.