An air curtain machine regulates the flow of indoor and outdoor air by creating an airflow that forms a barrier at doorways or openings. Installed to minimize temperature loss and prevent the entry of dust and insects, it enhances indoor comfort. The high-speed airflow generates a transparent air barrier, preventing the exchange of cold or hot air between indoors and outdoors, leading to energy savings and stable indoor temperatures. Widely used in commercial and industrial spaces such as malls, supermarkets, restaurants, and warehouses, these machines also serve environments like refrigerated storage rooms. Various designs cater to diverse environmental needs.