From: Naomi Kelly <nkelly**At_Symbol_Here**CLEMSON.EDU>
Subject: Re: [DCHAS-L] Standard Chemical Fume Hood Face Velocities
Date: Wed, 20 Apr 2016 16:09:28 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: D33D2074.125B08%nkelly**At_Symbol_Here**clemson.edu
Demystify:
Our standard is 100fpm at 18" sash height; vertical opening sashes. We accept 80fpm with confirmed smoke containment. We require installed sash stops at 18" on all new hood installations.
By a quick show of hands, what face velocity do all of you consider as an acceptable velocity for certifying standard chemical fume hoods in academic and research labs? OSHA is pretty vague on the issue (must provide adequate ventilation [1910.1450(e)(3)(iii)]).
Appendix A (non-mandatory) references Prudent Practices, where 80-100 is standard, up to 120 is okay for high hazard (no containment benefit proven) and 60fpm may be okay for low flow, specially designed hoods.
Before getting into too much detail, I am curious as to what all of you are considering as passing at 18in sash height, and what you are considering as failing.
Regards,
Brandon S. Chance, M.S., CCHO
Associate Director of Environmental Health and Safety
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