The document provides details on the design of a cleanroom ceiling and ductwork layout using Autodesk Revit and AutoCAD. Key elements include: 1) A ceiling layout for a cleanroom with a height of 3750mm including supply and return HEPA filters and diffusers. 2) Modular ceiling panels of 1200x2400mm are used and the layout includes the location of HEPA filters which are sized based on required air volume and flow velocities. 3) A ducting layout maintains a top of duct height of 8200mm and considers transformations, elbows, fittings and take-offs in the design. 4) The layouts are exported from Revit to AutoCAD for