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

An exhaust duct module configured to be assembled in the field to form a fire-rated exhaust duct assembly, said exhaust duct module comprising:

• an inner duct liner formed with a generally rectangular cross-section, said inner duct liner having a flange at one end and a flange at another end;
• an outer casing formed with a generally rectangular cross-section and being sized to substantially surround said inner duct liner;
• a first flange connector configured to be attached to said flange at one end of said inner duct liner and one end of said outer casing, and couple said inner duct liner to said outer casing;
• a second flange connector configured to be attached to said flange at the other end of said inner duct liner and one end of said outer casing, and couple said inner duct liner to said outer casing;
• and
• said first flange connector and said second flange connector being configured to be field attachable to couple another exhaust duct assembly.

A modular fire-rated exhaust duct assembly comprising:

• two or more exhaust duct modules;
• each of said exhaust duct modules having an inner duct liner and an outer casing, and a void being formed between at least a portion of space between said inner duct liner and said outer casing, said void being configured for receiving an insulation material, and including one or more insulation encapsulation sections configured to connect to said inner duct liner and said outer casing to contain said insulation material in said void;
• a first exterior flange connector, and one end of each of said exhaust duct modules being configured for receiving said first exterior flange connector;
• a second exterior flange connector, and another end of each of said exhaust duct modules modules being configured for receiving said second exterior flange connector;
• said inner duct liner comprising a flange configured to be affixed to said first exterior flange connector and a flange configured to be affixed to said second exterior flange connector;
• said first and said second exterior flange connectors being configured to form a field assembly junction for coupling respective ends of said exhaust duct modules to form a single exhaust duct run;
• and
• at least one joint encasement section configured to be field connectable to each of said exhaust duct modules and encase said junction;
• wherein said at least one joint encasement section comprises a plurality of low-profile joint encasement sections, each of said low profile joint encasement sections having a flange formed on a longitudinal edge to form a longitudinal attachment surface, and said flange for each of said low-profile joint encasement sections comprising a low profile configuration for accommodating one or more low profile fasteners, and said longitudinal attachment surface for each of said low-profile joint encasement sections being configured to affix said encasement section to respective ends of adjacent said exhaust duct modules.