> >Yes, insofar as we would want to identify uses that compromise the hood;s operation, like clutter and or heat or other turbulence-generating activities.
>
At Cornell, we called that a "hood housekeeping score"; criteria for that score are described in the Cornell LVMP.

> >- whether it's operating as designed relative to the general ventilation system in the lab?

> >That would be more difficult to check. I won't pretend that is something we systematically follow up on in my institutions; I'm curious to know what others are doing?

Again at Cornell, the annual fume hood face velocity check also includes a check at the lab door with dry ice to assure that the room was negative to the hallway. This acts as a surrogate for this factor. If negative pressure to the hallway is lost, it's likely that the general ventilation in the room as a whole needs to be assessed.

- Ralph

Ralph Stuart
rstuartcih**At_Symbol_Here**me.com

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