From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: Fwd: [DCHAS-L] ASHRAE TC9.10 - Lab Classifications - LVDL guideline
Date: Mon, 23 Apr 2018 15:42:00 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 162f406f9e9-c8b-39c5**At_Symbol_Here**

Aw shoot:  Here's the biggest issue I have with the standard:

"2.   Energy recovery system Various types of energy recovery systems can be used depending on the hazards in the exhaust. The type can affect efficiency and the potential for recirculation of exhaust. Options include runaround loops (least efficient, but safest), heat pipes (more efficient), and rotary heat exchangers (heat wheels) (most efficient, potentially least safe)."

The ACGIH Manual of Recommended Practice does NOT recommend these heat wheels except for air that is essentially free of toxic contaminants. And one reason is that the two air streams, in-going and out-going, actually pass each other without a barrier between them at one point.   To believe this works, you'd have to believe that contamination of a jacuzzi can be prevented by assigning a section for peeing.

These heat wheels return contaminated air.  The argument about the system is only limited to how much air is returned.  And that will vary with a number of factors.  So in any laboratory where the ASHRAE Lab Standard also requires 100% exhaust this is not appropriate equipment.  

I'm a member of both ASHRAE and ACGIH.  Every building I've planned needs design elements from both types of engineering.  ASHRAE should limit their standards to the systems in the name of their organization..  

Monona Rossol, M.S., M.F.A., Industrial Hygienist
President:  Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
Safety Consultant:  SAG-AFTRA
181 Thompson St., #23
New York, NY 10012     212-777-0062


-----Original Message-----
From: Debbie M. Decker <dmdecker**At_Symbol_Here**UCDAVIS.EDU>
Sent: Mon, Apr 23, 2018 2:21 pm
Subject: [DCHAS-L] Fwd: ASHRAE TC9.10 - Lab Classifications - LVDL guideline

Please see the note below. And please have a look at the document.  It's pretty good, if I do say so myself. 


Sent from my iPhone

Begin forwarded message:

From: "Adam R. Bare" <ABare**At_Symbol_Here**>
Subject: ASHRAE TC9.10 - Lab Classifications - LVDL Guideline
TC 9.10 Lab Classifications Subcommittee:
I=E2=80™m very happy to report that the LVDL guideline has been published, and is now available for download from ASHRAE's free publications page, located here:  Here's a direct link to the document:
Thanks to everyone for their hard work on this considerable task.  I feel it's an achievement that we should all be proud of.  Now it=E2=80™s time to spread the news, so the industry starts using it!
Adam R. Bare, PE, LEED AP
desk 404 730-8448 | cell 678 358-0147 | main 404 730-8400
Newcomb & Boyd
Consulting Engineering Group • Commissioning Group
Special Technologies Group Lighting Design Group
Atlanta Charleston
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