| 摘要 |
A double floor for removing air from rooms, particularly clean rooms, which are connected to the air supply system of a ventilating and/or air-conditioning unit. The double floor has an upper floor plane formed by perforated plates. The perforated plates are supported by support members. On the underside of the perforated plates is provided a stiffening system composed of stiffening members. Cover members are provided on portions of the stiffening system facing away from the perforated plates. The cover members form at least in the regions of the edges of the stiffening members nozzle openings which project beyond the lower plane of the stiffening system. All the nozzle openings open in the same direction.
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