Abstract: An air extraction device including suction apparatus having a suction nozzle situated on a box arranged at the rear of a worktop, the suction nozzle being connected to an extraction duct, the device including supply apparatus having a blower fan connected to a fresh air inlet and a supply tube containing at least one supply nozzle provided with an air outlet slot, the air exiting the slot in the form of at least one air curtain directed towards the suction nozzle, the supply tube being situated at the end of an articulated arm. The articulated arm is pivotably mounted such that, when the arm is in a low position, the air curtain separates a breathing area of an operator in front of the worktop from a handling area situated on the worktop, such that the operator's movements do not cross the air curtain.

Abstract: Device (10, 110) for renewing air in an enclosure, including a discharge means (14) for the air inside the enclosure containing harmful vapors and/or polluted air and/or humidity, a fan (22) being located within the discharge means and being suitable to convey this inside air through the discharge means, and a means (26) for opening the door of the enclosure that makes it possible to lock and unlock the door, the unlocking of the door being subsequent to a manual or automatic opening command from an opening control means, the door remaining locked when the opening means is activated, its deactivation being performed after unlocking conditions are met. The device additionally includes at least a means (17, 27) for purifying the air before it is evacuated through the exhaust duct.

Abstract: Device for extracting toxic powders or vapours, used with a weighing device on which is placed a container containing products that give off toxic powders or vapours, including a blow nozzle (14) for blowing air to carry toxic vapours to an open top surface of the container and actuated when it is placed facing the container's top surface, and a suction nozzle (16) for sucking up air laden with toxic powders or vapours which has been blown by the blow nozzle, and actuated when it lies facing the open surface of the container, the two nozzles being lowered by a motor (30) to position them facing the container's upper surface. The device includes a safety means for preventing the nozzles from being lowered if there is an unforeseen obstacle underneath one of the nozzles.