From: Jim Doughty <jdoughty**At_Symbol_Here**MIT.EDU>
Subject: Re: [DCHAS-L] Fume Hood Ducting
Date: Thu, 12 Oct 2017 21:14:17 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 534CEE6D-2567-4B54-8B37-4F031D954D2B**At_Symbol_Here**mit.edu
In-Reply-To
Demystify:
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.
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?
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