The document provides specifications for calculating the external frame size of fabric for a 3D tension fabric system (3DTFS) based on the overall size. It gives formulas for determining the external frame size and beam/post lengths for different 3DTFS configurations, including square ends to external corners, square ends to internal corners, internal 3D to internal 3D, external 3D to external 3D, and external 3D to internal 3D. It also provides contact information for the manufacturer.