The American Society of Heating, Refrigerating, and Air-Conditioning Engineers, has created the ASHRAE 110-1995 Method of Testing Performance of Laboratory Fume Hoods, a protocol for fume hood testing. This protocol does not specify a performance level fume hoods should meet; It simply provides a more thorough protocol for fume hood performance testing than has historically existed. This protocol allows occupational safety organizations, such as those listed above, to adopt new performance standards to this more thorough method of testing. The ASHRAE 110 is a three part test that includes measurements of face velocity, air-flow visualization, and tracer gas containment. This exhaustive test protocol goes beyond face velocity measurement to test the ability of a fume hood to contain and exhaust fumes. Air flow visualization requires the generation of smoke streams at designated points within a fume hood. It provides a visual understanding of the air flow currents that exist within the hood. The tracer gas containment test releases a large volume of gas at a prescribed location in a hood. A mannequin is positioned in front of the hood face with a monitoring device affixed in its breathing zone. The monitoring device tests for the presence of the tracer gas outside the hood.