Rectangular Hollow Sections (RHS) are very popular in many forms of construction and other structural & mechanical applications. This has been greatly assisted by the section’s inherent flat surfaces making it more economical for joining and other fabrication processes. In this instance, and unlike CHS, the sections only need to be straight-cut (when joining to other flat surfaces) instead of profile cut (e.g. when preparing a CHS end or when joining to curved surfaces). Minimal edge preparation is required for joining and welding RHS.
Like CHS, RHS can be used for architectural aesthetics, possessing clean lines, it is functional, and interacts less with external environmental effects.