WINDOW RESEARCH INSTITUTE

Chicago window

A window with a large fixed window (or fixed pane) in the center, flanked by two vertically sliding operable sash windows on either side. This design allows ample natural light to enter the interior while also providing ventilation through movable side windows. The Chicago window emerged following the urban redevelopment of Chicago after the Great Fire of 1871. At that time, the introduction of fire-resistant steel-frame construction and elevators led to the rise of tall buildings, and the Chicago window, with its expansive glass panels, became a popular choice for these structures.

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