Types A VG, AVZ, AVZ-D, and other mass-produced air-cooling units are used in the process units of chemical plants, petroleum refineries and gas processing plants, and in pipeline compressor stations and underground gas storage stations for cooling and condensation of different media. Manufacturers deliver them in individual units and parts (heat-exchange sections, blades and bosses, fans, electric motors, fan commutator and diffuser units, beams, crossbeams, diagonal braces, crossbars, and cables for bearing metal structures), which requires a large amount of assembly and welding work at the assembly site.