From: Peter Zavon <pzavon**At_Symbol_Here**ROCHESTER.RR.COM>
Subject: Re: [DCHAS-L] High performance hoods
Date: June 27, 2012 10:28:00 PM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <1B4D1665F78352429F7714A6540EB03629429F34**At_Symbol_Here**>

True as far as it goes, but being well designed is only the beginning. The
hood must be well and appropriately installed AND used properly by the lab
occupants. The best design and installation can be completely negated by
improper use.

Peter Zavon, CIH
Penfield, NY


-----Original Message-----
From: DCHAS-L Discussion List
[mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Ralph B Stuart
Sent: Wednesday, June 27, 2012 10:47 AM
Subject: Re: [DCHAS-L] High performance hoods

Does anyone have experience with such hoods and have they
found them to be acceptable for use with common solvents. Are
there any downsides to their use?

I have seen demonstrations of them that indicate that they
work as well as more traditional hoods in terms of
containment. Aerodynamically, there's nothing particularly
magic about 100 fpm, so I believe that a well designed hood
should be able to provide the same protection at 80 fpm and
don't forsee any operational downsides. Some jurisdictions
have regulators who need to be convinced of this, though.

Maybe someone with more direct experience of the lower flow
hoods knows of other challenges they present?

- Ralph

Ralph Stuart CIH
Laboratory Ventilation Specialist
Department of Environmental Health and Safety Cornell University


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