Double floor for removing air from rooms

Claim 1

In a double floor used in a system for removing air from a room which is connected to an air supply system of a ventilating or air-conditioning system, the room having a floor, the double floor being supported by a plurality of support members so that a hollow space is defined between the double floor and the floor of room, the double floor including an upper floor plane and a lower floor plane, the upper floor plane being formed by perforated plates, a stiffening system composed of spaced-apart stiffening members being mounted between the upper and lower floor planes, the improvement comprising the lower floor plane comprising at least one baffle plate in each space between stiffening members, each baffle plate having longitudinal side edges, one of the longitudinal side edges being mounted in the lower floor plane of the double floor, the other of the longitudinal side edges being spaced from the lower floor plane and being located below the lower floor plane and above the floor of the room, so that the baffle plates define with the lower floor plane a plurality of nozzle openings, wherein the nozzle openings open into the hollow space in the same direction, wherein the longitudinal side edges of adjacent baffle plates are arranged so as to overlap each other in a scale-like manner at a stiffening member.