Textbook in PDF format Vortex Ventilation: Shaped Units of Energy-Saving Ventilation Systems presents innovative methods for optimizing ventilation systems through vortex zone and computational fluid dynamics analysis. The research explores separated flows in ventilation elements, offering insights for students and professionals. The work introduces computational fluid dynamics methods to map vortex zones in duct fittings, enabling energy-efficient designs. Strategic shaping along these zones reduces aerodynamic resistance, decreasing energy consumption and operating costs. This approach allows for smaller fan sizes and reduced capital costs across entire systems