US Pat. No. 10,507,500

BIOSAFETY CABINET WITH VERSATILE EXHAUST SYSTEM

LABCONCO CORPORATION, Ka...

1. A biosafety cabinet comprising:a frame defining an enclosed work area, said frame having a back wall and defining a front access opening for user access to the work area;
a work surface positioned along a bottom of the work area extending from adjacent the front access opening to said back wall;
one or more intake openings positioned along the front access opening in front of said work surface;
a recirculation duct in fluid flow communication with said intake openings;
a supply filter in fluid flow communication with said recirculation duct;
a supply blower positioned upstream from said supply filter in fluid flow communication with said recirculation duct, wherein said supply blower is adapted to supply filtered down flow air to the work area;
one or more exhaust openings extending along a portion of the work surface, wherein at least one of said one or more exhaust openings is positioned adjacent the front access opening rearward of the intake openings;
an exhaust duct in fluid flow communication with said exhaust openings, wherein said exhaust duct is separate from said recirculation duct and configured such that down flow air entering the exhaust duct through said one or more exhaust openings remains separate from down flow or recirculating air flowing through said recirculation duct; and
an exhaust filter in fluid flow communication with said exhaust duct.