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Subject: Re: [DCHAS-L] Fume Hood Ducting
Date: Thursday, October 12, 2017 at 5:14:17 PM
Author: Jim Doughty <jdoughty**At_Symbol_Here**MIT.EDU> 		Next by Date:
Subject: Re: [DCHAS-L] Safety Equipment for K-12 Science Classes
Date: Thu, 12 Oct 2017 17:17:24 -0500
Author: Meg Osterby

From: Jim Doughty <jdoughty**At_Symbol_Here**MIT.EDU>
Subject: Re: [DCHAS-L] Fume Hood Ducting
Date: Thu, 12 Oct 2017 21:33:36 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 88B8FAA1-40A1-4AAE-A7E2-A50D2F286478**At_Symbol_Here**mit.edu
In-Reply-To <534CEE6D-2567-4B54-8B37-4F031D954D2B**At_Symbol_Here**mit.edu>


As a further note I would ask if your researchers are using oil most filters, and if so are they being maintained? The most common we have,BOC Edwards, need to be periodically drained (there is drain plug in the side). If the oil reaches a certain level the oil most will blow by the filter and not filter at all. 

Jim

Sent from my iPhone

On Oct 12, 2017, at 5:29 PM, Jim Doughty <jdoughty**At_Symbol_Here**MIT.EDU> wrote:

Hello,

We experienced this in our Chemistry Department; however, we believed it to be from vacuum pumps and the likely culprit were those pumps that had hard connections to their exhaust duct. A better setup is to insert the vacuum pump hose into the duct and let room air flush the duct out continuously. Hard connections are frequently made unintentionally when some tries to figure out how to keep the hose from falling out of the duct and then duct tapes over the whole thing or similar. This was particularly noteable in our labs with a high glove box density.

Hope that helps.

Jim Doughty
MIT

Sent from my iPhone

On Oct 12, 2017, at 4:46 PM, Elizabeth Brubaker <ebrubaker**At_Symbol_Here**MURRAYSTATE.EDU> wrote:

Has anyone experienced accumulation of oil (perhaps mineral oil from a heated oil bath?) in fume hood duct work? Is this reasonable or even possible? Could a sufficient amount remain in the system for it to condense out in the ducts when the exhaust fans were turned off for an extended period?

--
Beth Brubaker
Laboratory/Safety/Waste Coordinator
Murray State University Department of Chemistry
2226 Jesse D. Jones Hall
Murray, KY  42071-3300
(270) 809-6390
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