NCD is an air treatment control unit with double sandwich buffer panelling fixed to the frame with a panel-holder (no screws are used, to avoid any risk of seepage), with aluminium profiles with rounded-edge forms. The internal machine components are: new, high-efficiency heat exchangers with limited pressure drops, dual-suction centrifugal fans with forward or reversed blades, plug fans with inverter control, three-damper mixing chamber, wide choice of high-surface filters for reducing pressure drops and increasing the lifespan, PVC drop separator, heat recovery units with high thermal exchange. Wide range of accessories for air suction/expulsion and for the fan motor sections, and for common sections like the pressure gauge and pressure switch.