Prefabricated structures Prefabricated Structures Using Hot Rolled Steel Frames For A Hospital Building In Coimbatore. Hot Rolled Steel Columns And Floor Joists Are Used For Wall And Roof Structures. Aerocon Panels Are Used For Exterior Waals And Interior Partitions. Heavy Duty Cement Fibre Boards With Exterior Grade Used For Floor And Roof. Aerocon Panel Sizes Aerocon Panels Aerocon Panel Dealers in Coimbatore