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Has anyone developed policies for when the use of ductless fume hoods is appropriate? For example, ductless fumehoods are ok for pouring of not more than 5/50/500 ml of acetone. We generally discourage them, but inquiring minds want to know... - Ralph -- Ralph Stuart, CIH Environmental Safety Manager University of Vermont Environmental Safety Facility 667 Spear St. Burlington, VT 05405 rstuart**At_Symbol_Here**uvm.edu fax: (802)656-5407