From: Monona Rossol <actsnyc**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Fume Hood & Lab ventilation presentation for Engineering students - what would you include?
Date: Fri, 11 Oct 2013 09:49:22 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 8D0949FD359F4F1-198C-15CEA**At_Symbol_Here**
In-Reply-To <3718bec8.00000da0.0000000e**At_Symbol_Here**>

Have a copy of the ACGIH's Industrial Ventilation: A Manual of Recommended Practice on hand to loan them. All the basics are there in engineer-ese.   
Remind them that ASHRAE 62 references this Manual as an alternative to their standard which should be used for what is defined as Class 4 air (air that could contain enough contaminants to be a health or safety hazard).  There is a general drawing for the spray booth in the manual with all the calculations for it. ACGIH, I believe, still recommends a higher face velocity because their primary aim is protecting the operator and not energy savings.  ASHRAE waves in the "wind."  It always finds cockamamie ways to lower fresh air requirements when there is another energy crisis and you may remember the sick building issues in the 80s.  And ambient CO2 levels are 100 - 200 ppm higher than they were in the 1970s.  My reports all recommend staying with ASHRAE 62-2001 fresh air requirements combined with the better placement of supply/exhaust.
For gosh sakes tell them that the ACGIH Manual specifically recommends avoiding Heat Wheel energy recovery systems for this class 4 exhaust.  These wheels pass the two air streams past each other.  To believe they work you would also have to believe you can assign a section of a Jacuzzi for peeing.  
Be suspicious of LEED's recommendations regarding anything industrial.  They are usually wrong.  I know a building where a heat wheel was used for this kind of exhaust, so don't tell me it can't happen.  And that building has LEED certification.
The manual also has, in the chapter on hood design, good drawings of the turbulence issues created in systems by the presence of operators or objects.
Monona Rossol, M.S., M.F.A., Industrial Hygienist
President:  Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
181 Thompson St., #23
New York, NY 10012     212-777-0062

-----Original Message-----
From: Lawrence M Gibbs <lgibbs**At_Symbol_Here**STANFORD.EDU>
Sent: Thu, Oct 10, 2013 7:26 pm
Subject: Re: [DCHAS-L] Fume Hood & Lab ventilation presentation for Engineering students - what would you include?

1.       Industrial ventilation is quite different from typical office building HVAC
2.       Round ductwork is energy and transport efficient - still see labs built with rectangular ductwork of an office building
3.       Local exhaust ventilation is a primary engineering control system for researchers; make it as easy to use as possible
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Kim Gates
Sent: Thursday, October 10, 2013 12:02 PM
Subject: [DCHAS-L] Fume Hood & Lab ventilation presentation for Engineering students - what would you include?
I have the opportunity to give a 1 hr presentation to the Engineering student section of ASHRAE that meets on our campus. I am going to talk about fume hoods & lab ventilation. I will give a short presentation and then take them to a lab so they can test face velocity with my various Alnors.
I'm planning on including ASHRAE Industrial Ventilation, ANSI/AIHA Z9.5, SEFA-1, NFPA 45, Laboratory Fume Hoods by G. Thomas Saunders, and Laboratory Ventilation Work Book by D. Jeff Burton as resources. 
As a chemical safety professional, what do you wish the graduating Engineering students knew about fume hoods and lab ventilation? 
Thanks, as usual, for your input!

Kim Gates
Laboratory Safety Specialist
Environmental Health & Safety
Stony Brook University
Stony Brook, NY 11794-6200
FAX: 631-632-9683
EH&S Web site:

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