Abstract: U-shaped coupling profiles hold in a building structure a floating ceiling or they constitute a grating to which sound-absorbing components or lighting fittings can be secured. A number of the coupling profiles are, in addition, adapted to supply or conduct away air or to receive electric leads or to hold walls in order to render the space beneath the coupling profiles technically suitable for a given use of said space. In order that the areas of air inlet and outlet and the areas of the electric connections can be better chosen in accordance with the intended use of the space, each of the plurality of coupling profiles is appropriate for receiving in common electric leads and at least one air control.