"It is recommended that the user make provisions to have the following test performed on all laboratory fume hoods. These tests should be performed by qualified personnel to verify proper operation of the fume hoods before they are put to use. Testing should be repeated at least annually, or whenever a significant change in the hood system occurs. Any unsafe conditions disclosed by these tests should be corrected before using the hood. It is recommended that hoods be tested in accordance with ASHRAE 110-1995(or most current edition) before put into service.

The ASHRAE 110 test is a method of testing the performance of laboratory fumehoods. There are three test procedures incorporated into the 110 test; the first is the face velocity grid test, the second is the flow visualization or smoke test, and the third is the tracer gas containment test. The ASHRAE 110 is the recognized method for evaluating the performance of fume hoods; ASHRAE has defined three modes, As Manufactured (AM), As Installed (AI), or As Used (AU). The ASHRAE test should be conducted by an authorized person cognizant of each of the three test procedures."

- Excerpt from SEFA 1-2002, Recommended Practices for Laboratory Fume Hoods.