Fire-rated modular duct assembly suitable for exhausting flammable or hazardous gases, vapours and other materials

  • US 9,976,768 B2
  • Filed: 01/13/2017
  • Issued: 05/22/2018
  • Est. Priority Date: 01/06/2012
  • Status: Active Grant
First Claim
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1. An inner duct liner for a fire-rated exhaust module having an outer casing and first and second external flange connectors, said inner duct liner comprising:

  • one or metallic sections formed into a tubular structure with a defined cross-sectional shape and comprising a first transversal end and a second transversal end;

    each of said metallic sections having a longitudinal edge, and the longitudinal edges of adjacent metallic sections being joined together utilizing a connection mechanism to form an air tight and liquid seal between the longitudinal edges;

    said first transversal end including a flange configured to be affixed to the first external flange connector; and

    said second transversal end including a flange configured to be affixed to the second external flange connector.

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