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Previous by Date: Subject: Re: [DCHAS-L] [safety3] Operating Experience Level 3 2020-02: New Chemical Accident Reporting Requirements Date: Monday, May 11, 2020 at 9:46:03 AM Author: Angela M Aparicio <asands**At_Symbol_Here**FNAL.GOV> |
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>I imagine air flow is middle to edge. Does that mean that all protected people need to be towards the center of the room - facing the hoods?
I have done tracer gas work in a variety of laboratories and in my experience, general air flow patterns in labs are quite unpredictable and unreliable to address fugitive odors. This is even more so if you are trying to control particles such as viruses. If you are trying to protect people from viruses, general air ventilation is not an effective approach (which is why we have biosafety cabinets).
> Do the hoods extend the 6‰?? required distance (as they are giving velocity to the air in the room)?
No, not at all. Hood capture tends to be within 6 inches to a foot of the hood sash. Again, particles are more likely escape a hood than gas contaminants.
Thanks for asking good questions that are likely to arise in many labs.
- Ralph
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859
ralph.stuart**At_Symbol_Here**keene.edu
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