SYSTEM FOR IMPROVING AIR QUALITY AROUND A BLACKBOARD VIA LOCALISED EXTRACTION OF CONTAMINATED AIR

The invention relates to a system for improving air quality around a blackboard (1) via localised extraction of contaminated air, which comprises at least one of the following devices: - a blackboard (1') perforated with openings (8) on the surface, - an eraser (10) capable of sliding in respective guides (9) along the blackboard (1), - a manual eraser (5) with an air intake (12), - a cleaning port (18) with a bearing surface (17) perforated with through-holes (16) for leaving the manual eraser (5), wherein: - each device comprises a plenum (2) or extraction chamber that communicates the room in which the blackboard (1) is placed with an outlet mouth (3) for extracting the air via an extraction duct, such that the pressure inside the plenum (2) is lower than the pressure inside the room.