From: Rita Kay Calhoun <r.calhoun**At_Symbol_Here**MOREHEADSTATE.EDU>
Subject: Re: [DCHAS-L] Chemistry Fume Hood Experience
Date: April 29, 2013 11:36:23 AM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <CAKoY-_xe0Bpu9P8CX-Vkz_1_t25h3A5nSxC9_XCDXMnb_fzQDg**At_Symbol_Here**>

Mary Ellen,

                When they built our new labs they discovered that the amount of supply air coming through the diffusers (or whatever they’re called) was insufficient.  The solution was to replace many of the ceiling tiles with open grate type tiles and pump supply air into the ceiling space.  This has solved that problem.  By the way, we didn’t have alarm problems; we had “air flow from the hoods into the room” problems.  It was noticed when we were doing a Cu/S experiment.  You can always count on SO2 to let you know when it’s not where it’s supposed to be. The most interesting part was that the display still read 100lfm, even when the flow was 100lfm into the lab!




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Mary Ellen A Scott
Sent: Monday, April 29, 2013 10:47 AM
Subject: Re: [DCHAS-L] Chemistry Fume Hood Experience


The biggest issue we have is supply air or lack there of.   At least all are VAV hoods go into alarm so much that the students just put paper in the MUTE button.  We seem to have created a cry wolf situation.


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