Fuente: WIPO "circular economy" The present disclosure provides a flow accelerator device comprising an inverted aerofoil-shaped cross-section formed by one or more panels (41, 42), defining a leading edge (5), trailing edge (7), upper surface, and lower surface, where the lower surface extends further than the upper surface. Mechanically connected to a base (3) fixed upstream of a duct, the device generates low pressure within the duct to enhance air extraction. By leveraging aerodynamic principles, the device increases airflow efficiency in chimneys, fireplaces, ventilation towers, and similar structures. Its application includes buildings such as residential houses, offices, and industrial facilities, providing effective airflow management and smoke extraction. The flow accelerator operates passively, requiring no external power, making it a sustainable solution for improving indoor air quality and smoke removal while maximizing energy efficiency.