The four-sided cassette inverter models FDTC from the “Premium” series and the “Diamond” series from MITSUBISHI HEAVY INDUSTRIES are characterized by a European design and a flat panel, and are suitable for installation on suspended ceilings 600 x 600 mm. The distinctive look created by the German industrial design company Zweigrad GmbH & Co. KG. combines a lattice design with a unique structure and a pure white panel, that fuses with the room. The flow prevention panel (optional) protects people in the room from a direct cold or hot jet, with the possibility to control each individual valve. The motion sensor (optional) detects human presence to improve comfort and energy savings.