Abstract: A demountable partitioning system comprises multi-purpose aluminum extrustions adapted to be snap-fitted together in a number of different configurations to suit different constructional and system design requirements. The system centers around two universal sections (FW1,FW11) each in the form of a rectangular channel open at one side and provided with formations (3,4,5) enabling other extrustions selected from a glazing infill section (FW3), a blank end section (FW4), and a door infill section (FW5) each provided with complementary formations (8,10) to be snap-fitted onto one or more sides of the universal section (FW1,FW11). Extruded aluminum plastic or glazing channels (FW6,FW7,FW8) capable of engaging with a number of different glazing beads (FG) can be snap-fitted with the universal sections (FW1,FW11) and with the glazing infill (FW3) for assembling single or double glazing as desired to the universal sections (FW1,FW11).