Fire-rated ventilation duct and improvements therein

Abstract

A fire-rated ventilation duct system and improvements therein. According to an embodiment, the fire-rated ventilation duct section comprises, an inner liner configured as conduit for air movement, the inner liner comprising a metallic material and having a first end and a second end, and the first end including a first connection section, and the second end including a second connection section; an outer casing configured for encasing the inner liner, the outer casing comprising a metallic material having a fire-rating, the outer casing having a first end and a second end, and the first end including a first duct connection section configured for joining one end of a second fire-rated ventilation duct, and the second end including a second duct connection section configured for joining one end of a third fire-rated ventilation duct; an insulation layer configured to provide a thermal insulation layer between the inner liner and the outer casing, and the first connection section of the inner liner further comprising a first liner spacer and the second connection section of the inner liner further comprising a second liner spacer, the first and the second liner spacers being configured to define a cavity for receiving and positioning said insulation layer between an outer surface of the inner liner and an inner surface of the outer casing; the first duct connection section of the outer casing being configured to attach to at least a portion of the first connection section of the inner liner, and the second duct connection section of the outer casing being configured to attach to at least a portion of the second connection section of the inner liner to form a sealed duct section.

We claim: 
     
         1 . A fire-rated ventilation duct section comprising:
 an inner liner configured as a conduit for air movement, said inner liner comprising a metallic material and having a substantially rectangular cross-section profile, and said inner liner having a first end and a second end, and said first end including a first connection section, and said second end including a second connection section;   an outer casing configured for encasing said inner liner, said outer casing comprising a metallic material and having a substantially rectangular cross-section profile, and having a fire-rating, said outer casing having a first end and a second end, and said first end including a first duct connection section configured for joining one end of a second fire-rated ventilation duct, and said second end including a second duct connection section configured for joining one end of a third fire-rated ventilation duct;   an insulation layer configured to provide a thermal insulation layer between said inner liner and said outer casing, and said first connection section of said inner liner further comprising a first liner spacer and said second connection section of said inner liner further comprising a second liner spacer, said first and said second liner spacers being configured to define a cavity for receiving and positioning said insulation layer between an outer surface of said inner liner and an inner surface of said outer casing;   said first duct connection section of said outer casing being configured to attach to at least a portion of said first connection section of said inner liner, and said second duct connection section of said outer casing being configured to attach to at least a portion of said second connection section of said inner liner to form a sealed duct section.   
     
     
         2 . The fire-rated ventilation duct section as claimed in  claim 1 , wherein said inner liner comprises a substantially square cross-section profile and said outer casing comprises a substantially square cross-section profile. 
     
     
         3 . The fire-rated ventilation duct section as claimed in  claim 2 , wherein said first connection section and said second connection section for said inner liner comprise a liner spacer section having a broken J-profile formed on each traverse edge of said inner liner. 
     
     
         4 . The fire-rated ventilation duct section as claimed in  claim 2 , wherein said first connection section and said second connection section for said inner liner comprise a liner spacer section having a broken L-profile formed on each traverse edge of said inner liner. 
     
     
         5 . The fire-rated ventilation duct section as claimed in  claim 2 , wherein said first connection section and said second connection section for said inner liner comprise a slip-on liner spacer section having a broken J-profile, and each of said slip-on broken J-profile liner spacer sections being configured for coupling and connecting to a respective traverse edge of said inner liner, so that said fire-rated ventilation duct section comprises a field-modifiable configuration. 
     
     
         6 . The fire-rated ventilation duct section as claimed in  claim 2 , wherein said first connection section and said second connection section for said inner liner comprise one or more slip-on liner spacer sections, each having a broken L-profile, and each of said slip-on broken L-profile liner spacer sections being configured for coupling and connecting to a respective traverse edge of said inner liner, so that said fire-rated ventilation duct section comprises a field-modifiable configuration. 
     
     
         7 . The fire-rated ventilation duct section as claimed in  claim 2 , wherein said outer casing comprises two or more outer casing panels configured to be joined together at respective longitudinal edges, and each of said outer casing panels having corresponding traverse edges. 
     
     
         8 . The fire-rated ventilation duct section as claimed in  claim 7 , wherein said first duct connection section and said second duct connection section for said outer casing comprise a broken J-profile formed on each traverse edge of said outer casing panels. 
     
     
         9 . The fire-rated ventilation duct section as claimed in  claim 7 , wherein said first duct connection section and said second duct connection section for said outer casing comprise a roll formed J-profile formed on each traverse edge of said outer casing panels. 
     
     
         10 . The fire-rated ventilation duct section as claimed in  claim 7 , wherein said first duct connection section and said second duct connection section for said outer casing comprise one or more roll formed slip-on connector sections having a J-profile, and each of said roll formed slip-on J-profile connector sections being configured for coupling and connecting to a respective traverse edge on each of said outer casing panels, so that said fire-rated ventilation duct section comprises a field-modifiable configuration.