The ANSI/ASHRAE 110 test is a method of testing the performance of laboratory fume hoods. There are three test procedures incorporated into the ASHRAE 110 test:

1. Face Velocity Grid Test
2. Flow Visualization or Smoke Test
3. Tracer Gas Containment Test

ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) has defined three modes for evaluating fume hoods. They are: as Manufactured (AM), as Installed (AI), and as Used (AU).

The AM mode requires the manufacturer to test the fume hood in their facility and provide the test data with the hood. The AI mode is the most common mode used for testing fume hoods to this standard. It is done after the unit is installed and prior to use by laboratory personnel. It verifies the unit is operating properly and safely. The AU mode is a dynamic test performed in an actively occupied lab. This test is usually used as a diagnostic test to ascertain the nature or source of a problem.

For more information regarding ASHRAE 110 testing of your fume hoods, please contact your regional ENV office for further assistance.