Fume hood

Abstract

A fume hood used in either a laboratory or industrial setting, the fume hood includes a cabinet formed with a chamber having a generally flat work surface, an open face and a sash door assembly for reciprocally opening and closing the open face. The fume hood further includes an airfoil directing airflow through the open face and into the chamber. A baffle is disposed in the fume hood. The baffle has a plurality of rows of regularly laterally spaced apertures wherein the rows are regularly spaced apart along the length of the baffle. The fume hood further includes an exhaust outlet from the chamber.

1 . A fume hood, comprising:
 (a) a cabinet formed to define a chamber having a generally flat bottom work surface, opposed side walls, a top wall, a rear wall and an open front and a sash door mounted at the open front of said chamber for reciprocal movement on a vertical plane to selectively provide an access opening to said chamber;   (b) an airfoil disposed proximate the open front and the work surface of the cabinet for directing air through the access opening and into the chamber;   (c) at least one baffle including a plurality of rows of regularly laterally spaced apertures wherein said rows are regularly spaced apart along the height of the baffle; and   (d) at least one air exhaust outlet from the chamber formed in the top wall.   
     
     
         2 . The fume hood of  claim 1  wherein the apertures of the baffle are substantially rectangular in shape. 
     
     
         3 . The fume hood of  claim 1  wherein there are at least four rows of laterally spaced apertures. 
     
     
         4 . The fume hood of  claim 1  wherein the rows of apertures are spaced apart in approximately 12-inch intervals. 
     
     
         5 . The fume hood of  claim 1  wherein the apertures are substantially uniformly sized. 
     
     
         6 . The fume hood of  claim 1  wherein the baffle extends upward for a predetermined distance and includes an upper portion that slopes upward and forward. 
     
     
         7 . The fume hood of  claim 1  wherein the baffle further includes a plurality of rows of mounting screws adapted to fasten the baffle to a rear segment of the cabinet. 
     
     
         8 . The fume hood of  claim 7  wherein the mounting screws provide fastening points adapted for insertion of apparatus rods. 
     
     
         9 . The fume hood of  claim 7  wherein there are two rows of mounting screws. 
     
     
         10 . The fume hood of  claim 1  and further including:
 (a) a first cable connected to a first side of the sash door and a second cable attached to a second side of the sash door; 
 (b) a first pulley arranged on a top side of the cabinet for receiving the first cable and directing the first cable horizontally; 
 (c) a second pulley arranged on the top side of the cabinet for receiving the first cable after it is received by the first pulley and directing the first cable downward into a slot in the top wall of the cabinet; 
 (d) a third pulley arranged on a top side of the cabinet for receiving the second cable and directing the second cable horizontally; 
 (e) a fourth pulley arranged on the top side of the cabinet for receiving the second cable and directing the second cable laterally; 
 (f) a fifth pulley arranged on the top side of the cabinet for receiving the second cable and directing the second cable downward into the slot; and 
 (g) a counterweight attached to the first and second cable. 
 
     
     
         11 . The fume hood of  claim 10  wherein a motor pulls the first and second cables to raise the sash upward on a vertical plane. 
     
     
         12 . The fume hood of  claim 1  wherein the airfoil is adapted to be movable to a first position and a second position. 
     
     
         13 . The fume hood of  claim 12  wherein when the airfoil is in the first position the airfoil is flush with the work surface, and when the airfoil is in the second position it is raised relative to the work surface. 
     
     
         14 . The fume hood of  claim 13  wherein the airfoil has a rounded shape. 
     
     
         15 . The fume hood of  claim 13  wherein the airfoil has an angular shape. 
     
     
         16 . The fume hood of  claim 1  wherein the airfoil is disposed flush with the work surface. 
     
     
         17 . The fume hood of  claim 1  wherein the airfoil is disposed in a low profile position wherein the airfoil is disposed above the work surface. 
     
     
         18 . The fume hood of  claim 17  wherein the airfoil is disposed approximately ⅜″ above the work surface. 
     
     
         19 . The fume hood of  claim 1  wherein the airfoil extends the length of the open face. 
     
     
         20 . A fume hood, comprising:
 (a) a cabinet formed with a chamber and having an open front face;   (b) an automated sash assembly adapted to cover the open face;   (c) an airfoil directing airflow through the open front face into the cabinet;   (d) a baffle including a plurality of ports allowing the airflow to be drawn behind the baffle by way of the Venturi effect, resulting from an increase in velocity of the airflow up and behind the baffle; and   (e) at least one air exhaust outlet from the cabinet.   
     
     
         21 . The fume hood of  claim 20  wherein the automated sash assembly includes:
 (a) a sash door mounted for vertical reciprocal movement in the open front face; 
 (b) a first cable connected to a first side of the sash door and a second cable attached to a second side of the sash door; 
 (c) a first pulley arranged on a top side of the cabinet for receiving the first cable and directing the first cable horizontally; 
 (d) a second pulley arranged on the top side of the cabinet for receiving the first cable after it is received by the first pulley and directing the first cable downward into a slot in the cabinet; 
 (e) a third pulley arranged on a top side of the cabinet for receiving the second cable and directing the second cable horizontally; 
 (f) a fourth pulley arranged on the top side of the cabinet for receiving the second cable and directing the second cable laterally; 
 (g) a fifth pulley arranged on the top side of the cabinet for receiving the second cable and directing the second cable downward into the slot; and 
 (h) a counterweight attached to the first and second cable. 
 
     
     
         22 . The fume hood of  claim 20  wherein the airfoil is adapted to be movable to a first and a second position. 
     
     
         23 . The fume hood of  claim 22  wherein when the airfoil is movable between a first position flush with a work surface and a second position raised relative to the work surface to thereby facilitate airflow over and through the front of the chamber. 
     
     
         24 . The fume hood of  claim 20  wherein the airfoil is flush with a work surface of the cabinet. 
     
     
         25 . The fume hood of  claim 20  wherein the airfoil is raised relative to a work surface of the cabinet facilitating airflow over and through the open front face. 
     
     
         26 . The fume hood of  claim 25  wherein the airfoil is ⅜″ above the work surface. 
     
     
         27 . The fume hood of  claim 20  wherein the airfoil extends the length of the open face. 
     
     
         28 . The fume hood of  claim 20  wherein the airfoil has a rounded shape. 
     
     
         29 . The fume hood of  claim 20  wherein the airfoil has an angular shape. 
     
     
         30 . The fume hood of  claim 20  wherein the ports are arranged in a plurality of rows and are regularly laterally spaced within said rows. 
     
     
         31 . The fume hood of  claim 30  wherein the ports are substantially rectangular in shape. 
     
     
         32 . The fume hood of  claim 30  wherein there are at least four rows of vertically spaced ports. 
     
     
         33 . The fume hood of  claim 30  wherein the rows of ports are spaced apart in 12-inch intervals. 
     
     
         34 . The fume hood of  claim 30  wherein the ports are substantially uniformly sized. 
     
     
         35 . The fume hood of  claim 20  wherein the baffle extends upward for a predetermined distance and includes an upper portion that slopes upward and forward. 
     
     
         36 . The fume hood of  claim 20  wherein the baffle further includes at least one row of mounting screws adapted to fasten the baffle to a rear segment of the cabinet. 
     
     
         37 . The fume hood of  claim 36  wherein the mounting screws provide fastening points adapted for insertion of apparatus rods.