Ultra-violet ventilation system having an improved filtering device

Abstract

An air ventilation system, comprising an air inlet for admitting contaminated air into the ventilation system, an air outlet for discharging decontaminated air from the ventilation, and an ultra-violet light source disposed therebetween. The ventilation system has a filter disposed upstream of the ultra-violet light source. The filter has a grease particle separator with at least two layers of expanded metal associated therewith. Each has a predetermined number of apertures forming a reticulum. A cartridge filter may be provided for each grease particle separator and disposed upstream thereof. Each cartridge filter and associated grease particle separator preferably forms an integral filtering unit and may be placed at any location of the system.

1 . An air purifying device comprising: 
 a structure having an air inlet for disposal over a source of contaminated grease laden air and an air outlet for discharging the air stream to ambient, said air inlet and said air outlet defining a grease laden air flow;    a device being adjacent said air inlet with said device defining a compartment, said device for reducing an amount of grease in the contaminated grease laden air stream, wherein said device has a first member extending into said compartment, said grease laden air flow abruptly turning around said first member in said compartment, said grease laden air flow jettisoning an amount of grease from said grease laden air flow after flowing past said first member and reducing a grease particle size of grease in said grease laden air flow, said device having a plurality of sheets of material with each of said plurality of sheets having a plurality of apertures therethrough.    
   
   
       2 . The air purifying device of  claim 1 , wherein said plurality of apertures of a first sheet of said plurality of sheets of material are offset from said plurality of apertures of a second sheet of said plurality of sheets of material.  
   
   
       3 . The air purifying device of  claim 2 , wherein said plurality of apertures of said first sheet, and wherein said plurality of apertures of said second sheet form a labyrinthine air flow pattern.  
   
   
       4 . The air purifying device of  claim 2 , wherein said plurality of apertures of said first sheet, and wherein said plurality of apertures of said second sheet form a turbulent air flow pattern.  
   
   
       5 . The air purifying device of  claim 1 , wherein said plurality of apertures of a first sheet of said plurality of sheets of material are offset from said plurality of apertures of a second sheet of said plurality of sheets of material, and wherein at least some of said plurality of apertures have a shape being conducive to reduce an amount of grease in said grease laden air stream.  
   
   
       6 . The air purifying device of  claim 1 , wherein said plurality of apertures of a first sheet of said plurality of sheets of material are offset from said plurality of apertures of a second sheet of said plurality of sheets, and wherein said first sheet and said second sheet are made from a temperature resistant material.  
   
   
       7 . The air purifying device of  claim 1 , wherein said plurality of apertures have a predetermined shape, and wherein said predetermined shape is conducive to reduce an amount of grease from said grease laden air stream.  
   
   
       8 . The air purifying device of  claim 1 , wherein said plurality of apertures of a first sheet of said plurality of sheets of material are offset from said plurality of apertures of a second sheet of said plurality of sheets, said plurality of apertures of said first sheet of material and said second sheet of material forming a net like structure, said net like structure for reducing an amount of grease in said contaminated air stream.  
   
   
       9 . The air purifying device of  claim 1 , wherein said plurality of apertures are generally orthogonal shaped.  
   
   
       10 . The air purifying device of  claim 1 , wherein said plurality of apertures are generally diamonds shaped.  
   
   
       11 . An air purifying device comprising: 
 a ventilation structure having an air inlet for disposal over a source of contaminated grease laden air and an air outlet for discharging the air stream to ambient, said air inlet and said air outlet defining a grease laden air flow;    a grease removal device being adjacent said air inlet with said grease removal device defining a compartment therein, said grease removal device for reducing an amount of grease in the contaminated grease laden air stream, wherein said grease removal device has a first member extending into said compartment, said grease laden air flow abruptly turning around said first member in said compartment and jettisoning an amount of grease from said grease laden air flow after flowing past said first member, said grease removal device having a first sheet of material having a plurality of first apertures therethrough, and a second sheet of material spaced from said first sheet of material, said second sheet having a plurality of second apertures therethrough and communicating with said ventilation structure, wherein said plurality of first apertures are offset from said plurality of second apertures.    
   
   
       12 . The air purifying device of  claim 11 , wherein said first apertures and said second apertures form a netlike structure.  
   
   
       13 . The air purifying device of  claim 11 , wherein said first apertures and said second apertures each have a shape conducive to reduce said amount of grease from said grease laden air stream.  
   
   
       14 . The air purifying device of  claim 13 , wherein at least one of said plurality of apertures has a diamond shape.  
   
   
       15 . The air purifying device of  claim 13 , further comprising an ozone producing device on or in said ventilation structure for reducing said amount of grease from said grease laden air stream.  
   
   
       16 . The air purifying device of  claim 1 , further comprising an ozone producing device on or in said ventilation structure for reducing said amount of grease from said grease laden air stream.  
   
   
       17 . An air purifying device comprising: 
 a structure having an air inlet for disposal over a source of contaminated grease laden air and an air outlet for discharging the air stream to ambient, said air inlet and said air outlet defining a grease laden air flow;    a device being adjacent said air inlet with said device defining a compartment, said device having a first section for abruptly changing a grease laden air flow, said first section reducing an amount of grease from said grease laden air flow, said device having a second section for changing said grease laden air flow from a laminar flow to a turbulent air flow, said second section further reducing said amount.    
   
   
       18 . The air purifying device of  claim 17 , further comprising an ozone producing device on or in said ventilation structure for reducing said amount from said grease laden air stream.  
   
   
       19 . The air purifying device of  claim 17 , wherein the device changes said grease laden air flow from a laminar flow to a turbulent air flow by passing said grease laden air flow through a net like structure, said second section further reducing said amount of said grease in said grease laden air stream.  
   
   
       20 . The air purifying device of  claim 19 , wherein said net like structure has a grease particle separator comprising at least two layers of expanded metal associated therewith, each having a plurality of predetermined apertures forming a reticulum.