Richard,

I was involved with the initial phases of a rather large purchase of Erlab GreenFumeHoods and a smaller purchase and installation of AirClean ductless systems for rotary evaporators while I was at a previous job.  In both cases, traditional ducting was not an option.  The Erlab hoods were being purchased for an organic chemistry teaching lab.  During the vetting of this system, I had to provide a list of all of the chemicals that will be used within the hood in order to proceed as the manufacturer wanted to verify that their filtration systems would work.  I had to do the same when ordering the rotary evaporator ductless systems.

As part of our internal SOPs, the Erlab hoods were not allowed to be used for research purposes.  This is because as soon as one changes from teaching labs, where all of the components being used are planned and in known quantities, to research operations, there is no control over what may be passing through the hoods.  I know the Erlab hoods have been in operation for about a year at that facility and if you email me (bchance**At_Symbol_Here**princeton.edu) directly, I will put you in touch with the manager running that facility.  He speaks very highly of the Erlab systems.

I hope this helps,