About This Archive  | DCHAS-L 2020 Index   | DCHAS-L Yearly Index
person wearing a disposable face shield and surgical style mask

Check out Safety Emporium for your N95, N99, and face shield needs.

Previous by Date:
Subject: Re: [DCHAS-L] Hood shut down
Date: Monday, March 30, 2020 at 11:34:02 AM
Author: ILPI Support <info**At_Symbol_Here**ILPI.COM> 		Next by Date:
Subject: Re: [DCHAS-L] Hood shut down
Date: Mon, 30 Mar 2020 15:37:14 +0000
Author: Dr Bob

From: Louis DiBerardinis <loudib**At_Symbol_Here**MIT.EDU>
Subject: Re: [DCHAS-L] Hood shut down
Date: Mon, 30 Mar 2020 15:34:59 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: E032CC5D-9563-4764-A403-1947EBC5A148**At_Symbol_Here**exchange.mit.edu
In-Reply-To <9AEF2886-E5ED-4589-8448-5C8EF8C09EBC**At_Symbol_Here**keene.edu>


Or suck air down the stack if the building is under negative . Likely if other hoods are left on. and their exhaust could be entrained to the building. If those hoods are used or have chemical storage could have an issue. So whatever is done balancing the systems should be done.

Sent from my iPad

On Mar 30, 2020, at 11:31 AM, "Stuart, Ralph" wrote:

>> In the (unlikely) event you have 4 ACH with the hoods off then the ducts will act as stacks and suck in air from the outside.
>
> There are many class labs that are likely to have ACHs that are much higher than 4, if there is more than one hood per 500 square feet of floor space. I agree that turning hoods off entirely may not be appropriate, but if the chemicals are not being used and appropriately stored, there are likely to be opportunities to reduce air flow in many hood settings. We have reduced our air flow in our hoods significantly in our two class labs.
>
> - Ralph
>
> Ralph Stuart, CIH, CCHO
> Environmental Safety Manager
> Keene State College
> 603 358-2859
>
> ralph.stuart**At_Symbol_Here**keene.edu
>
> ---
> 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.