There are many considerations that must be analyzed when adding or replacing a chemical fume hood in your lab. One of the initial decisions is whether to consider using a Green Fume Hood (a filtered, recirculating fume hood) or to just stay with a conventional ducted fume hood. Many people unknowingly and incorrectly limit the applications for Green Fume Hoods (GFH) to just those historically considered most appropriate for 'ductless' fume hoods. | 
