From: Ken Kretchman <kwkretch**At_Symbol_Here**>
Subject: Re: [DCHAS-L] SF6 fume hood certification
Date: Fri, 12 Nov 2021 10:49:50 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: CAOYSQ49XYm4VK1EoNrJOXqpJ2hJHGsAM_V7mTiDC2j4Jug7V-w**At_Symbol_Here**
In-Reply-To <2F3F79D1-23B2-4496-978D-E556D16F09D6**At_Symbol_Here**>


I think you probably know but there is a committee which has been investigating the ASHRAE 110 protocol with that in mind. I am not sure if Tom Smith of 3Flow is subscribed here but he
is part of that effort and a good contact point of course.


Ken Kretchman, CIH, CSP, FAIHA Director, Environmental Health and Safety
NC State University / Box 8007 / 2620 Wolf Village Way / Raleigh North Carolina 27695-8007
Email: Ken_Kretchman**At_Symbol_Here** / Phone: (919).515.6860 / Fax: (919).515.6307

On Fri, Nov 12, 2021 at 7:45 AM Ralph Stuart <ralph.stuart**At_Symbol_Here**> wrote:
With COP 26 finishing up, those of us involved in assessing fume hood performance are thinking (again) about the use of SF6 as a tracer gas in fume hood evaluations (SF6 has 22,800 times the greenhouse gas potential of CO2). With this in mind, I have a couple of questions for the list:

1. Have CHAS members investigated alternatives to testing every fume hood using the ASHRAE 110 tracer gas test as written, using SF6 as the tracer gas?

2. Has anyone changed their fume hood acceptance protocol to try to reduce the amount of such tests that are conducted for climate impact mitigation purposes?

3. Has anyone calculated the relative climate impact of doing a commissioning test of a hood using SF6 relative to the lifetime climate impact of the energy required by that hood?

My personal opinion is that the test as written was designed to address specific design challenges associated with fume hoods when the standard was written in 1985. And it is based on a rather stilted scenario (a single user in a specific location with chemistry which is properly located in the hood). In my experience, essentially all hood installations since 1990 were designed and specified to pass that test and so additional 110 tests seldom generate actionable information. I am curious if other CHAS members have other experiences with this test?

Thanks for any information about these questions.

- Ralph

Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859


For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**
Follow us on Twitter **At_Symbol_Here**acsdchas
--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here** Follow us on Twitter **At_Symbol_Here**acsdchas

Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.