The FBD series explosion-proof axial flow fans with counter-rotating impellers for coal mine applications are developed and produced by Zibo Fan Factory Co., Ltd. Based on the summary of the existing counter-rotating axial flow fan structure and technical performance in China, this new generation of energy-saving local ventilation fans has a wide range of uses. The product features a reasonable structure, complete specifications, high efficiency, significant energy-saving effect, low noise, and long air supply distance. It can be used either as a whole unit or in stages according to different ventilation resistance requirements, thereby reducing ventilation energy consumption and saving energy. Ventilation can be maintained normally without moving the fan for tunnels up to 2000 meters in length, reducing the labor intensity of workers and saving ventilation time, making it an ideal equipment for local ventilation in coal mine underground. Additionally, it can also be used in high-pressure ventilation situations in metallurgy, non-ferrous metals, gold, chemical industry, shipbuilding, and ceramic industries. Its structural characteristics include explosion-proof for mining, counter-rotating, noise reduction, and axial flow. Main Applications and Scope of Use This product is mainly used as an explosion-proof axial flow fan for local ventilation in coal mine underground and is suitable for various chamber local ventilation scenarios in mining operations. It is also suitable for local ventilation in other mines and various tunnel ventilation scenarios.