duct element 10 is disposed on opposite sides of the particular row of pedestals 18 cooperating with the duct element the duct element of the fig4 embodiment acts in a dual capacity as a combined stringer for supporting in part the elevated floor 23 and as a dual cell arrangement for containing and segregating various wires and other interconnections running below the floor 23 referring again to fig2 and 4 and assuming this figure represents a plan view of a floor system using the embodiment illustrated in fig4 it is evident that the duct element 10 supports those portions of the elevated floor 23 which are directly over the duct elements 10 however areas of the floor 23 which are not directly over the duct elements 10 are supported by the pedestals 18 thus in the case of the fig4 embodiment certain of the floor panels 24 are supported in part by the pedestals 18 and in part by the duct element 10 an alternative preferred embodiment of the present invention is illustrated in fig5 in this embodiment the access floor panels 24 are supported directly by the pedestals 18 rather than by the cells 11 and the duct element 10 resides entirely below the top of the pedestal 18 in the embodiment illustrated in fig5 the adjustable collar 25 includes an upper platform 30 which supports the access floor panels as shown the access floor panels may be secured.