Flanking transmission
Flanking transmission, also known as noise flanking, a flanking path, or indirect sound transmission, is the transmission of sound between spaces through indirect pathways within a building that bypass the primary separating element, such as a wall, floor, or ceiling. In architectural acoustics, sound may travel through connected structural elements, gaps, ductwork, pipes, ceilings, floors, or other parts of a building, reducing the effectiveness of a partition's intended sound insulation.