We are small college currently in the planning stages of a lab renovation. We are converting from one large general chemistry lab and one small organic lab to a new large multi-purpose chemistry lab( only 1 chem professor at our school). We will mainly run 3 sections of gen. Chem , 1 section of organic and 1 section of 100 level physical science per semester and those will be the courses taught from the new lab space. My questions are:

1. What is everyone's experience with vertical sash versus combination sash in fume hoods? From my experience the problem with the vertical sash is the student never places the sash to the proper height( yes, even with clearly marked height levels and explanation of use) . Do the combination sash with lockable panels help with the miss use by student ? Are there other problems associated with combination sash or vertical sash?

2. What is everyone's experiences with high performance fume hoods verse Bypass fume hoods? Our chemistry professor feel =96"high performance, low velocity fume hoods do not seem to work as well in heavy duty organic labs where a lot of fumes are generated." Of course, the school want the energy efficiency of a high performance, but I want to recommend the best overall. I have been told that our chem professor's experience was due to improperly maintained fume hoods(not balanced with room environment, HVAC etc.) and spillage caused these issues. Please provide me some advice

Thank you

Andrea Voehringer

CHO

Bluefield State College