Abstract: A parallel-walled ventilation duct assembly with integrated low-profile subducts, and/or methods of manufacturing the assembly are provided. The assembly of embodiments includes a main shaft body defined by at least one wall surrounding an interior cavity and at least one low-profile subduct disposed within the interior cavity. The cross-sectional area of the main shaft body has a rectangular or an obround shape. The low-profile subduct includes an interior channel defined by a plurality of walls. The low-profile subduct is integrated into at least one wall of the main shaft body such that at least one wall of the plurality of walls of the low-profile subduct includes at least a portion of an interior surface of the at least one wall of the main shaft body, and the portion of the interior surface of the at least one wall includes a flat portion of the interior surface.

Abstract: Sub-ducts and methods of exhausting into a generally rectangular and vertical main shaft are disclosed herein. A sub-duct of one embodiment includes hollow first and second portions. The first portion presents a generally flat attaching wall, a top side that defines an opening, and a bottom side that has an aerodynamic configuration; the second portion defines an intake opening, meets with the first portion attaching wall at approximately a ninety degree angle, and has a configuration complementary to a configuration of an exhaust duct. The first and second portions collectively define a continuous channel between the intake opening and the top side opening. The first portion may have a section of generally constant cross section extending from adjacent the second portion to the top side opening, and the second portion may have a generally constant cross section extending from the intake opening to the first portion.