NFPA 45 recommends 4 ACH even when the lab is not occupied. Some other ACH ranges are reported as follows:
OSHA 1910.1450 Appendix A Section C.4(f) Normally adequate 4-12
NFPA-45 Typical for occupied laboratories
Minimum for unoccupied laboratories 4
Typical for occupied laboratories >8
ASRAE Applications Handbook Minimum range 6-10
National Research Council Normally adequate 6-12
AIA 4-12
ANSI/AIHA Z9.5 None given
Richard Palluzi
PE, CSP
Pilot plant and laboratory consulting, safety, design, reviews, and training
www.linkedin.com/in/richardppalluzillc/
Richard P Palluzi LLC
72 Summit Drive
Basking Ridge, NJ 07920
rpalluzi**At_Symbol_Here**verizon.net
908-285-3782
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Stephen Beaton
Sent: Tuesday, February 23, 2021 9:30 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] Lab Ventilation
Good morning all:
A similar topic on lab ventilation came up in DCHAS a number of years back, but I would like to dig a bit further. I am interested in your thoughts and feedback, especially if any new recommendations/best practices have been made, particularly in academic laboratories.
Follow up – what criteria do you use to classify high risk vs low risk research labs?
I’m reviewing our current practices, and looking at adopting from ANSI Z9.5 2012 and ASHRAE TC9.10 (some familiar names as contributors).
Your comments are greatly appreciated.
Steve
Stephen Beaton, MSc, CHO, CRSP
Chemical Safety Manager
Environmental Health and Safety Office
DALHOUSIE UNIVERSITY
902.494.1934
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