There is no difference between marine fans and land fans. However, because it is used in ships, it has its own characteristics in performance parameters, design, structure, materials and so on. For example, in order to reduce the size, most centrifugal fans use forward blade impellers; In order to prevent corrosion, explosion and reduce weight, aluminum impellers are mostly used; In order to facilitate disassembly and assembly on board, the axial fan is made into an open casing structure that can swing the motor and impeller out of the casing, and the centrifugal fan is made into a structure that can remove the impeller from both sides of the casing, etc. Other special fans, such as those for hovercraft, are different from land-based products and need special design.