Pre-fabricated modular fire-rated conduit assembly

A modular conduit assembly, said modular conduit assembly comprising:

• two or more duct sections;
• each of said duct sections having an inner duct liner, an outer casing, and a plurality of casing spacers configured to form a thermal insulating cavity between at least a portion of space between said inner duct liner and said outer casing, said thermal insulating cavity being configured for receiving a thermal material;
• said inner duct liner comprising a metallic material having a thickness for providing a specified fire-rating;
• wherein each casing spacer of said plurality of casing spacers has (i) a mounting surface, and said mounting surface is mechanically affixed with a mechanical fastener to an inner surface of said outer casing, and having (ii) another mounting surface, and said other mounted mounting surface being configured to abut against the outer surface of said inner duct liner without being affixed to the outer surface of said inner duct liner so as to maintain the structural integrity of said inner duct liner, and further including (iii) a casing spacer flange affixed to the outer surface of said inner duct liner and configured to restrain said respective casing spacer;
• a first exterior flange connector attached to one end of each of said inner duct liners;
• a second exterior flange connector attached to another end of each of said inner duct liners;
• said first and said second exterior flange connectors being configured to form an assembly junction for coupling respective ends of said duct sections to form a connected run of said duct sections;
• and
• a joint connection end formed between said exterior flange connector and said outer casing, said joint connection end being configured to receive a joint insulating material, and further comprising a return configured for receiving a connection edge of a joint cover, said joint cover being configured to encapsulate said joint connection ends of adjacent duct sections modules.