Air curtains, installed according to doors or openings in general, create an invisible barrier of different temperatures, preventing the escape of cold air in the summer and warm air in the winter in order to stop the transfer of heat from one environment while simultaneously blocking pollutants and insects from entering from outside. They can also be used inside the building to separate rooms with different conditions, for example, heated spaces and unheated warehouses or dining areas and kitchens, facilitating staff movement and preventing the transfer of odors and vapors.