Recently, news came from the National Intellectual Property Administration that an enterprise has successfully obtained a patent titled "A Water - proof Device for Negative Pressure Fans", with the authorization announcement number CN 222633469 U, and the application date can be traced back to June 2024. The patent abstract shows that this water - proof device for negative pressure fans has an ingenious structure, consisting of a negative pressure fan body and a protective component. The negative pressure box of the negative pressure fan body adopts a through - cavity structure, with a baffle fixed inside, a limit frame set parallel at one end, a carrier frame at the center equipped with a drive motor and rotating blades, and symmetric connection parts on the outside. The protective component effectively blocks rainwater from splashing into the fan through symmetric insertion posts at the ends, avoiding corrosion of key components such as motors and blades, and greatly ensuring the normal operation of the fan. The birth of this patent provides strong support for the stable operation of industrial fans in complex outdoor environments, and is expected to promote technological innovation in the industry and improve the durability and reliability of fan equipment.