• US 3,880,062 A
  • Filed: 11/08/1973
  • Issued: 04/29/1975
  • Est. Priority Date: 11/08/1973
  • Status: Expired due to Term
First Claim
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1. Hood means for efficiently entraining airborne particulate matter, such as originates from a charbroiler during cooking, from above a work surface of known side-to-side and front-to-rear dimensions while minimizing the volume of air flow required, said hood means comprising:

  • side wall means defining right and left side walls rising from adjacent the right and left sides of the work surface and having front and rear portions, front wall means having a lower edge portion spaced upwardly from the work surface and generally overlying the front side thereof, said front wall means defining a smooth aerodynamically curving interior forward wall rising from said lower edge portion for assuring streamline flow of air therealong and within said hood means, said front portions of said side wall means, said lower edge portions of said front wall means and the work surface together defining an entrance face for said hood means through which air flow enters for entraining airborne particulate matter from above the work surface, and rear wall means defining a rear wall rising from adjacent the rear side of the worK surface and having a lower portion directed forwardly toward said front wall means and an upper portion directed rearwardly away from the work surface, said side wall means, front wall means, rear wall means and work surface together defining an at least substantially closed path for air flow, said front wall means and said rear wall means lower and upper portions together defining a throat zone within said air flow path, and the throat zone having a crosssectional flow area less than the cross-sectional flow area of the entrance face.

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