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Have you confirmed that there is no reentrainment or reingestion of fume hood exhaust?   ... Jim

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On Fri, Oct 31, 2025 at 9:09 AM Filiberto Palacios <00001f5128a5fa0b-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:

Good Afternoon All,

I am currently working on a plan to recertify fume hoods in-house and was wondering if other institutions on this Listserv would be willing to share the following: (1) how many total air velocity measurements are averaged with the anemometer of choice? Is there a minimum your institution uses? 2) is there a depth into the fume hood which should be met for all measurements or would it be sufficient to take the measurements near the face of the fume hood? (3) what other measurements or qualitative testing is done to complete the recertification process? (I’ve seen that a smoke pencil is used to visually test the functionality of the fume hood). Please advise and thank you! 

Best,

Filiberto Palacios, MPH, CPH  |  Laboratory and Research Safety Officer
Division of Academic Affairs, Department of Biology and Chemistry, Azusa Pacific University
Azusa Pacific University PO Box 7000, Azusa, CA 91702-7000
(626) 815-6072 Ext. 6072  |  apu.edu

“Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing, and perfect will.” Romans 12:2

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