Abstract: The invention relates to a raised ventilation flooring structure (105,106) comprising a first and a second transverse support beam (107,108) extending substantially parallel in a transverse direction T at a predetermined mutual distance W. The support beams (107, 108) are interconnected via connection profiles (109, 110) to form a grid structure. Carrier profiles with side walls having a number of apertures, are supported with their ends on the support beams (107, 108). A panel with a closed surface is supported on each carrier profile with side edges of adjacent panels being spaced apart to form a ventilation gap (55). The support beams (107, 108) form elongate collection members that extends along and/or below the side walls of the carrier profiles in the length direction L, below the ventilation gap, to form collection channels (70,100).

Abstract: A ventilation system for ventilating a room, comprising: a lowered ceiling, defining a ceiling space between the lowered ceiling and a ceiling of the room and having an air permeable ceiling surface area; a raised flooring, supported by a support frame and defining a floor space between the raised flooring and a floor of the room, the raised flooring being air permeable over a floor surface area opposite to the air permeable ceiling surface area; an air supply inlet connected to the floor space; and an air outlet, connected to the ceiling space, wherein the air permeability of the raised flooring varies in dependence on distance from the air supply inlet for forming a substantial vertical air flow in which air entering the room through the floor surface area displaces air in the room in the vertical direction and forces air out through the ceiling surface area.