Centrifugal FRP fans consist of a casing, impeller, motor, and other components, while axial fans emphasize the FRP material of the impeller and casing. Key installation points include leveling the ground, lubricating bearings, adjusting the air inlet direction, and more. These details need to be added to the structure and installation maintenance sections to ensure users understand the correct installation steps.

In terms of application scenarios, besides chemical and wastewater treatment, search results also mention the electronics industry, electroplating, metallurgy, textiles, and other fields. In particular, the use of negative pressure fans in aquaculture and greenhouse applications, as well as the use of roof fans in building ventilation, require further refinement to explain selection considerations for different scenarios.