High velocity and high dilution exhaust system

Abstract

A nozzle for an exhaust fan that has a primary, central aperture for exhaust. Arranged around the periphery of the central aperture is a plurality of side apertures. The nozzle fits over the fan outlet. A stack may extend upwardly from the central aperture. Exhaust exiting the side apertures induces a flow of ambient air, especially when a windband encircles the nozzle. The ambient air increases the volume of exhaust exiting the windband.

1 . An exhaust nozzle comprising
 a central aperture,   a peripheral flange extending from said central aperture, and   a plurality of side apertures formed in the peripheral flange.   
   
   
       2 . The nozzle of  claim 1 , wherein
 the peripheral flange has four side apertures.   
   
   
       3 . The nozzle of  claim 1 , wherein
 the side apertures are arcuate.   
   
   
       4 . The nozzle of  claim 1 , further comprising an upstanding wall around the central aperture. 
   
   
       5 . The nozzle of  claim 1 , further comprising
 a lip formed in the upstanding wall, and   a stack extending upward from said upstanding wall, the bottom of the stack resting upon the lip.   
   
   
       6 . The nozzle of  claim 5 , wherein the stack is tapered. 
   
   
       7 . The nozzle of  claim 1 , further comprising a stack extending from the central aperture. 
   
   
       8 . The nozzle of  claim 7 , wherein the stack is tapered. 
   
   
       9 . An exhaust system comprising
 a fan having an outlet,   a nozzle over said outlet,   an exhaust stack extending upwardly from said fan,   the nozzle comprising
 a central aperture, 
 a peripheral flange extending from said central aperture, and 
 a plurality of side apertures formed in the peripheral flange. 
   
   
   
       10 . The exhaust system of  claim 9 , wherein
 the peripheral flange has four side apertures.   
   
   
       11 . The exhaust system of  claim 9 , wherein
 the side apertures are arcuate.   
   
   
       12 . The exhaust system of  claim 9 , further comprising an upstanding wall around the central aperture. 
   
   
       13 . The exhaust system of  claim 9 , further comprising
 a lip formed in the upstanding wall, and   a stack extending upward from said upstanding wall, the bottom of the stack resting upon the lip.   
   
   
       14 . The exhaust system of  claim 13 , wherein the stack is tapered. 
   
   
       15 . The exhaust system of  claim 9 , further comprising a stack extending from the central aperture. 
   
   
       16 . The exhaust system of  claim 15 , wherein the stack is tapered. 
   
   
       17 . The exhaust system of  claim 9 , wherein said exhaust stack has apertures located below the fan outlet, whereby ambient air entering the apertures flows through said side apertures.