Patent ID: RE40276

Claim:
A biological safety cabinet, comprising: a frame defining a protected work area, said work area being enclosed on all but a front face, said work area including a pair of spaced interior side walls; a sash coupled to said frame, said sash at least partially enclosing the open front face of said work area; a blower coupled to said frame generally above said work area, said blower being adapted to circulate air through said work area; and a sash grill coupled to said frame generally below said sash, said sash grill having a curved top surface, a plurality of first perforations through said top surface, and a plurality of second perforations through said top surface, said second perforations being larger than said first perforations and being located generally adjacent each of said side walls, said first and second perforations allowing air to flow through said sash grill, wherein the curved sash grill promotes smooth air flow into said work area, thereby better containing any harmful materials.