You might want to look at "Just Ignore That Noise, It's Just The Hood Alarm Again": Hood Alarms Issues at https://www.linkedin.com/pulse/just-ignore-noise-its-hood-alarm-again-alarms-issues-richard-palluzi/ where I talk about this issue in some detail.

Other articles on aspects of this question include Limiting Hood Openings: A Bad Idea at https://www.linkedin.com/pulse/limiting-hood-openings-bad-idea-richard-palluzi/ and "Why Can't We Put It In the Hood?" at https://www.linkedin.com/pulse/why-cant-we-put-hood-richard-palluzi/ .

The University of Wisconsin also has a section on proper hood usage including hood alarms in their course Pilot Plant Equipment 2: Safe Installation and Operation which will be given virtually on Nov 4-6^th this year. Details are available at www.epd.wisc.edu/RA01595 ..

Feel free to call me to discuss.

Good Afternoon,

Our chemical hygiene plan as well as other resources indicates the average face velocity should be between 80-120 LFM when sash is at 18 inches, and we do train users to check the local air flow monitor before use. If the monitor shows an air flow outside that range, we would not want users to use the chemical fume hood (exceptions are for equipment setup) and to report it. 

In addition, we are updating our alarm set points at a local (the end user is alerted) and at a system level (meaning EHS and facilities are alerted) for a higher level of control over these critical engineering controls. 

I would like to get opinions on what you have local air flow monitors set to alarm at (high and low), if you differentiate at a system level and any considerations to make. We do not have occupancy sensors on our hoods, but some are setup to adjust a damper when there is a drop in air flow. The other are constant volume with no adjustments possible with dampers . 

Thanks,

Jordan Sumliner

Associate Environmental, Health, Safety and Sustainability Specialist

Environmental, Health, Safety and Sustainability

GSK

14200 Shady Grove Road, Rockville, MD 20850

Email   jordan.x.sumliner**At_Symbol_Here**gsk.com

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