We are using the ductless Green Hoods in our new organic lab with no problems. They are not your average "ductless hood". We did change procedures to modify how we use methanol and ethanol in the hood. For our undergraduate labs, they were a perfect solution, saving energy and maintaining safety. But our experiments are designed to be run on the bench top safely in one of our standard teaching labs which have > 12 air exchanges per hour.
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