Patent ID: 8628388

Claim:
An enclosure mountable on a laboratory bench, comprising: a working chamber comprising an opening to the front of the working chamber allowing manual access to an item of scientific apparatus received in the working chamber and allowing ingress of air, a plenum chamber mounted to a rear of the working chamber and comprising an exhaust opening connectable to an air extraction system, and an apertured baffle so extending within the enclosure as to divide the working chamber from the plenum chamber, said apertured baffle configured to allow ingress of air from the working chamber into the plenum chamber, said apertured baffle defining a plurality of apertures; wherein the apertured baffle extends convexly into the plenum chamber, and the apertured baffle is curved in both a horizontal and a vertical direction, such that the apertured baffle has a dish profile, and wherein said apertured baffle is provided with at least one guiding vane configured to guide a direction of airflow.