The commentary to ANSI/AIHA Z9.5 (Laboratory Ventilation) addresses the issue of ductless fume hoods. Section 4.2 states that the air filtration system must be evaluated for each hazardous chemical and that a chemical-specific detector downstream of the filter must be in place. Given the wide variety of chemicals used in a typical laboratory, Z9.5 states that ductless fume hoods have "limited applicability".
Bruce Tobias (Contractor)
Manager, Safety & Environmental Health
Environment, Health, and Safety
Leidos Biomedical Research, Inc.
From: Richard W. Denton [mailto:rwdenton3**At_Symbol_Here**GMAIL.COM]
Sent: Tuesday, March 18, 2014 6:59 PM
Subject: [DCHAS-L] Ductless fumehoods or Not.
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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