Ceiling structure and facility comprising such a ceiling structure comprising air sterilisation means

A sterilization system for sterilizing a room, comprising:

• a false ceiling for supplying treated or not treated air in the room to be sterilized;
• at least one protective tensioned fabric, blocking UVC, the at least one protective tensioned fabric positioned on the underside and at a distance from the ceiling of the room to be sterilized, being fixed to the side walls of the room and arranged with an upper slab of the ceiling in order to delimit a so-called plenum space;
• at least one means for attaching the at least one protective tensioned fabric to the side walls of the room by means of at least one peripheral attachment profile comprising an air outlet slot opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum and the room to be sterilized;
• —at least one ventilation and/or air-conditioning means connected to the plenum via at least one air inlet air venting duct in the plenum, the blown air forming a horizontal unidirectional air circulation corridor over the entire length of the plenum;
• —an air return box able to be connected to ventilation and/or air conditioning means, as well as air suction openings located opposite the air outlet slot and allowing air to pass from inside the room to the air return box;
• and
• several UVC light sources arranged in the plenum over the entire length of the horizontal unidirectional air circulation corridor so as to sterilize the air flowing in the air circulation corridor before it passes through the air outlet slot, wherein a distance between the plurality of UVC light sources and the ceiling on the one hand and a distance between the plurality of UVC light sources and the at least one tensioned protective fabric on the other hand is at most 25 cm, and wherein the walls of the plenum have means of reflection of ultraviolet light emitted by the UVC light sources.