From: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM>
Subject: Re: [DCHAS-L] Hood Servicing SOP
Date: Tue, 12 Apr 2022 12:03:30 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: BN8PR07MB6340668849394B6F4D8C08EDD9ED9**At_Symbol_Here**BN8PR07MB6340.namprd07.prod.outlook.com
In-Reply-To


Hi Ralph!

Some readers might find the following link useful:

https://flowsciences.com/common-fume-hood-containment-problems/

Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences, Inc.

910 332 4878

www.flowsciences.com
å Linkedinå å 'å Facebook 'å Youtube ' Twitter
Customer Satisfaction Survey

CONFIDENTIALITY NOTE: This e-mail, including all attachments, is directedå in confidence solely to the person(s) to whom it is addressed, or an authorizedå recipient, and may not otherwise be distributed, copied or disclosed. Theå contents of this transmission may also be subject to intellectual property rightså and all such rights are expressly claimed and are not waived. The contents ofå this e-mail do not necessarily represent the views or policies ofå Flow Scienceså Inc. or its employees.


-----Original Message-----
From: ACS Division of Chemical Health and Safety On Behalf Of Ralph Stuart
Sent: Tuesday, April 12, 2022 7:38 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Hood Servicing SOP

> Usually the problem is a fan belt or motor that can be serviced on the 'clean' side.

I have addressed this question several times related to hood maintenance and each time a hood-specific review of the chemcial work done in the hood is necessary. This involves assessing what the possible contaminants of concern are likely to be present in the hood and ductwork and what sort of decontamination is appropriate. Given the wide variety of chemicals that could be used in a hood and the lack of information about quantities used, that can be a significant challenge. That approach doesn't lend itself to a policy statement very well.

Also, I'm not clear how the 'clean' side concept applies outside of radioactive materials hoods. Those hoods might have a HEPA filter in the duct to collect radioactive particles and the 'clean' side could be downstream of the HEPA filter? However, I don't know of any similar mechanism for chemical hoods, so I think everything downstream of the hood needs to be considered potentially contaminated (i.e. 'irty').

- Ralph


Ralph Stuart, CIH, CCHO
ralph**At_Symbol_Here**rstuartcih.org

---
For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas

---
For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org
Follow us on Twitter **At_Symbol_Here**acsdchas

Previous post   |  Top of Page   |   Next post



The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to secretary@dchas.org.
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.