Air-curtain device

Abstract

Disclosed is an air-curtain device ( 1 ) which can be positioned across the top of an openingsuch as a doorway ( 2 ), and comprises main air driving means ( 3 ) for providing a main airstream across the opening ( 2 ) to form a main air-curtain ( 4 ), and lateral air driving means ( 5 ) for providing a lateral airstream angled relative to the airstream from the main air driving means ( 3 ) to form a lateral air-curtain ( 6 ).

I claim: 
     
         1 . An air-curtain device for providing an air curtain from the top to the bottom of an opening, the device comprising:
 main air driving means for providing a main airstream generally vertically across the opening for forming a main air-curtain across the opening; and   at least a pair of lateral air driving means, the lateral air driving means positioned at or adjacent a respective end of the main air driving means, each for providing a lateral air-curtain airstream generally downwardly and angled relative to the airstream from the main air driving means to form a lateral air-curtain at a side of the opening.   
     
     
         2 . An air-curtain device according to  claim 1 , wherein the main and lateral air driving means each comprise at least one blower fan. 
     
     
         3 . An air-curtain device according to  claim 1 , wherein the main and lateral air driving means comprise at least one blower fan common to both means. 
     
     
         4 . An air-curtain device according to  claim 1 , wherein the main air driving means is configured to produce a main airstream which extends completely across the opening. 
     
     
         5 . An air-curtain device according to  claim 1 , wherein the main airstream is substantially planar. 
     
     
         6 . An air-curtain device according to  claim 5 , wherein in operation the main airstream is substantially parallel to the opening. 
     
     
         7 . An air-curtain device according to  claim 1 , wherein in operation the lateral airstream is angled partially towards a surround of the opening. 
     
     
         8 . An air-curtain device according to  claim 1 , wherein in operation the lateral airstream provides an air-curtain extending from the main air-curtain to a surround of the opening. 
     
     
         9 . An air-curtain device according to  claim 1 , wherein main air driving means is elongate. 
     
     
         10 . An air-curtain device according to  claim 1 , wherein lateral air driving means configured to drive air at more than one angle relative to the airstream of the main air driving means. 
     
     
         11 . An air-curtain device according to  claim 1 , wherein the lateral air driving means is configured to emit a divergent airstream. 
     
     
         12 . An air-curtain device according to  claim 11 , wherein the lateral air driving means comprises a plurality of adjustable air-directing vanes. 
     
     
         13 . An air-curtain device according to  claim 2 , wherein in operation the lateral airstream is angled partially towards a surround of the opening. 
     
     
         14 . An air-curtain device according to  claim 3 , wherein in operation the lateral airstream is angled partially towards a surround of the opening. 
     
     
         15 . An air-curtain device according to  claim 4 , wherein in operation the lateral airstream is angled partially towards a surround of the opening. 
     
     
         16 . An air-curtain device according to  claim 5 , wherein in operation the lateral airstream is angled partially towards a surround of the opening. 
     
     
         17 . An air-curtain device according to  claim 6 , wherein in operation the lateral airstream is angled partially towards a surround of the opening.