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From: Ralph Stuart <ralph**At_Symbol_Here**rstuartcih.org>
Subject: Re: [DCHAS-L] Fume hood article of interest
Date: Aug 31, 2021 18:26 UTC
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: DF699658-F42B-40B3-B84B-DE859F00B1CE**At_Symbol_Here**rstuartcih.org
In-Reply-To:
Many teaching labs have a single â??wasteâ?? hood which are kept on 24/7 to maintain some airflow through the room. They may not achieve 4 ACH that way, but teaching labs do have good control over when there is active chemical use in the lab. I suppose why this is an NFPA recommendation rather than a requirement.
- Ralph
Ralph Stuart, CIH, CCHO
ralph**At_Symbol_Here**rstuartcih.org
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