Abstract: A prefabricated integrated access deck panel includes a bottom flange, one or more structural webs, and an optional top flange. The bottom flange acts as a ceiling soffit, and may include radiant tubing for heating or cooling. The top flange, when present, acts as the floor surface and also supports components of the access floor system. Alternatively, only support rails are used to secure the removable and reconfigurable access floor panels. The webs includes apertures to allow the passage of air and components of the building's electrical, communication, water, and mechanical systems. Individual deck panels may either be directly interconnected to each other or joined by a common beam to form a diaphragm. Alternative embodiments are disclosed including different deck panel connection and support arrangements, different numbers and configurations for the webs and flanges, and single and dual plenum constructions.