Patent ID: 6648748
Filing Date: 2003-11-18
Classification: B08B,F23J

Abstract:
A conduit system for movement of an airstream and air borne particulate matter comprising:a primary duct, a plurality of flexible secondary ducts mounted in fluid cooperation to said primary duct, said primary duct including hollow rigid conduit sections interspersed between, and in fluid communication with, hollow flexible conduit sections, a first end of said primary duct sealed substantially air-tight, an opposite second end of said primary duct cooperating with an air extraction means for extracting air from said primary duct, said secondary ducts mounted at downstream ends thereof to said rigid sections and inclined at a first angle relative to said rigid conduit sections so that secondary airflows leaving said second ends of said secondary ducts are inclined at a first angle relative to an airflow stream in said primary duct so as to be directed in a downstream direction of said airflow stream in said primary duct to generally equalize vacuum levels at said second ends of said secondary ducts when said airflow stream is drawn along said primary duct so as to cause a vacuum in said primary duct, wherein said primary duct has a constant first diameter and wherein said secondary ducts have a second diameter, and wherein said first and second diameters form a first diameter: second diameter ratio of greater than two.