Non-metal prefabricated, portable data center buildings with high-efficiency environmental control; non-metal modular portable building units for use in the construction of buildings; non-metal buildings constructed of modular portable building units; non-metal floors, wall claddings and linings for structural integrity and environmental control, non-metal doors and door frames, non-metal windows and window frames, non-metal wall and ceiling panels, all being parts of portable buildings; part...