Air curtains are devices commonly used in commercial and industrial settings to create a barrier of air at doorways or openings, helping to maintain indoor climate control while allowing the easy passage of people and goods. Typically mounted above entrances, these devices emit a controlled stream of air across the doorway, forming an invisible curtain that acts as a barrier between the indoor and outdoor environments. The primary functions of air curtains include preventing the entry of external air, dust, insects, and pollutants, as well as minimizing the loss of heated or conditioned indoor air. This not only enhances energy efficiency by reducing the workload on heating, ventilation, and air conditioning (HVAC) systems but also contributes to improved indoor air quality. Air curtains find applications in a variety of sectors, including retail, hospitality, manufacturing, and healthcare, offering a practical solution for maintaining comfortable and sanitary indoor environments while promoting energy savings and sustainability.