These studies are ten years old and the ductless hood technology has advance considerably since then. You should look at the SEFA 9 – 2010 standard which discusses the Recommended Practices for Ductless Enclosures. The DH III type hood did not exist when the NIAD and OSHA studies were conducted. These types of hoods offer solutions to some of the issues sited. SEFA 9 also requires that an Application Questionnaire be submitted to the manufacturer to help you find the correct solution for your application. A ductless hood may or may not be appropriate for your application and the cost may or may not prove beneficial for you. A ductless enclosure or a ductless hood is not a direct substitute for a fume hood because a fume hood allows for a broader application. More often now, people are becoming more energy efficient and a ductless hood may be one way to save some of the energy used in a laboratory. Before you make a decision, you need to be certain that a ductless hood is safe and efficient for your application.
Vice President Engineering and Product Development
Kewaunee Scientific Corp
I have a question regarding NFPA 45. I am wondering how undergraduate research labs fit into the definition of Instructional laboratory units. As defined in the 2011 version of NFPA:
“used for education past the 12th grade and before post-college graduate-level instruction for the purposes of instruction of six or more persons for four or more hours per day or more than 12 hours per week. Experiments and tests conducted in instructional lab units are under the direct supervision of an instructor. Lab units used for graduate or post-graduate research are not to be considered instructional lab units.”
The definition specifically excludes graduate and post-graduate research. Why doesn't it exclude “undergrad research” too? This would be situations where the instructor is not always present, but labs where several undergraduate students are working at the same time.
Charlotte J. Head, P.E.
industrial environmental consultant
North Kingstown, RI 02852
In a message dated 03/19/2014 1:13:29 P.M. Eastern Daylight Time, bfoster**At_Symbol_Here**WVU.EDU writes:
Dan referenced NFPA 45 in his recent email.
I would like to mention that NFPA 45: Standard on Fire Protection for Laboratories Using Chemicals (current edition: 2011) is in the process of revision. The next edition is scheduled for 2015.
(I am a member of the 45 Technical Committee.)
Barbara L. Foster
Director of Laboratory Safety
Eberly College of Arts and Sciences
West Virginia University
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Daniel Crowl
Sent: Wednesday, March 19, 2014 12:13 PM
Subject: Re: [DCHAS-L] Ductless fumehoods or Not.
Look at this NIH policy document on ductless hoods. It is from 2005. That is where I got the NFPA reference for NFPA 45. It is section 6.4.1.
On Tue, Mar 18, 2014 at 4:59 PM, Richard W. Denton <rwdenton3**At_Symbol_Here**gmail.com> wrote:
I was asked by my department to assist in deciding whether to purchase ductless fumehoods for our undergraduate chemistry labs. We are planning to use these for flammable solvents, and reactions involving HCl and NaOH. These hoods will be used by undergraduates for research also. Any input on the safety issues involved with these equipments versus the regular hoods would be appreciated.
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