bob1, on 04 August 2010 - 06:19 PM, said:
It would depend what the purpose of the hood was? If you are looking for something to protect your samples from outside contamination then a laminar flow with the flow horizontal, or a re-circulating hood like is used for cell culture will be the best choices. If you are looking to protect yourself as well, the second option above is the best one.
Cheers, we don't work with anything toxic so it sounds like the horizontal flow hood would be best (and probably cheaper than the re-circulating hood).