Apparatuses for heating, refrigerating, drying and ventilating, namely ducts of metal for ventilating and air conditioning installations, ducts of metal for central heating installations; Ceiling diffusers, Linear slot diffusers, Long throw jet, nozzles, Floor diffusers, Ventilation valves, a control panel that manages diffusers to control the angle of air venting from air ventilation ductwork, Air supply grilles, Linear grilles, Linear floor grilles, Return grilles, Transfer grilles, External grilles; Accessories for ducts of metal for ventilating, air conditioning and heating installations, namely dampers, mounting frames and plenum boxes; Terminal units with HEPA filter namely plenum boxes with high-efficiency air filters; Air volume dampers for ducts, Constant air volume dampers, Pressure dampers, Variable air volume dampers, control modules that enable one to set and maintain a constant pressure in an aerobic duct network; Control modules to set and maintain constant air pressure in a duct network; Zoning systems for temperature control in air conditioning and heating installations using ducts, namely a control panel linked with thermostats to operate motorized dampers; Motorized damper for grilles, Motorized plenum box for grilles, Motorized plenum box for diffuser, Motorized damper for ducts; digital thermostats, control boxes for air conditioning systems; Adjustable pressure dampers for ducts; Rectangular fire dampers, Circular fire dampers, Expanding transfer grilles, Rectangular fire dampers, Circular fire dampers, Expanding transfer grilles Fire damper management system, namely a control panel to monitor and control fire dampers in air conditioning ducts, ventilating ducts and heating ducts; active chilled beams, namely air/water induction terminal units that simultaneously provide the supply, thermal treatment and diffusion of supply air, to set internal conditions at the desired comfort levels