The TFCC, TFHC and TFPC series features thermo-ventilating units equipped with a ventilator featuring a belt-driven engine. The structure consists of a girder-built under frame made of anti-corodal extruded aluminum section bars that are linked by means of Nylon Joints. The cabinet consists of multi-layer, painted steel panels. The engine-ventilator group is isolated from the rest of the structure by means of suitable buffers on the basement and a Neoprene anti-vibrating joint between the air inlet and the panels. The centrifugal fans featuring forward & backward oriented fins are balanced both fins: Devices working with water have 2 to 8 ranks. The filtering section is equipped with multiply synthetic filters with 85% ponderal filtering efficiency. Also the control device for temperature and humidity and frequency control unit can be installed upon request. The product series has its features as small volume, light weight and easy to be installed on the spot.