From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: [DCHAS-L] Fume Hood Ducting
Date: Fri, 13 Oct 2017 09:50:24 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 15f1600120e-c0b-42ed1**At_Symbol_Here**webjas-vaa175.srv.aolmail.net
In-Reply-To <006f01d343b2$8c193be0$a44bb3a0$**At_Symbol_Here**net>
Demystify:
Anyone who cleans the area around a stove in any house should be well aware that oils of all kinds volatilize and/or form mist particulates and deposits on surfaces. What do you think that nasty grease is all over your cabinet doors? Why do you think commercial kitchen hoods are called "grease hoods" and methods of cleaning the grease out of them and their filters is part of every restaurant maintenance schedule?
Take your chemistry head with you where ever you go.
Yes it is reasonable and possible for mineral oil, even at room temperature, to evaporate and condense on the duct work.Researchers working with high vacuum lines put low temperature traps on the low pressure side of the pump to prevent oil entering the system.While the vapor pressure of mineral oil is low it is significant that over time an oil film can develop on various surfaces.
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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