This document provides specifications for calculating fabric sizes for a 3D tension fabric system (3DTFS). It includes formulas for determining the silicone line size and beam/post lengths based on the overall external frame size for different 3DTFS configurations, including square ends to external/internal corners, internal/external 3D to internal/external 3D, and height. The specifications are needed because 3DTFS requires a different approach than standard tension fabric systems. Contact the fabric supplier for their specific formulas.