The NEBB Professional 2025 - Quarter 3

Since its inception, ASHRAE 110 has provided the in dustry with an effective means of evaluating the per formance of laboratory fume hoods. The three tests— face velocity, visualization, and, of course, the tracer gas containment—allow the tester to qualitatively and quantitatively measure the fume hood’s containment ability. In various locations, there are three ratings that can be determined as well: 1) AM, or As Manufactured, 2) AI, or As Installed, and 3) AU, or As Used. Each of these tests provides especially useful information for future fume hood development as well as for evaluat ing the performance of the hood. The As Manufactured testing is done at the manu facturer’s facility, verifying the design of the hood. As Installed testing is completed when the hood is in stalled in the laboratory setting and can determine the various laboratory influences on its performance, such as door openings or diffuser placement. AU, on the other hand, considers the actual way the hood is being used, with hot plates and ongoing experimentation. The ASHRAE 110 Committee is continuously looking to improve or refine the test procedures. Refinements through appropriate testing have been accompanied by new technological advancements that help develop modern technology. While this may sound like a lot of technical mumbo jumbo, the creation of a more effi cient delivery system—mainly the ejector—can and will revolutionize the necessary dispersion required for the successful performance testing of a critical piece of laboratory equipment. The process of introducing ASHRAE 110 Update: Fume Hood Testing By Don Fedyk, NEBB Fume Hood Testing CP, ASHRAE 110 Committee Member

The NEBB Professional | Quarter 3 | 2025

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