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 .
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