5410 Floors (115) 5411 Proprietary raised access floors (20) Proprietary raised access floors of dry construction, raised above the structural floor slab to create space for the distribution of building services, with removable panels for access 5412 Non-proprietary raised access floors (0) Access floors of dry construction, built in situ, raised above the structural floor slab to create space for the distribution of building services, with removable panels for access