What Is A Curtain Wall Window?

A curtain wall window refers to any individual glazed panel—fixed or operable—integrated within a curtain wall system. Unlike traditional windows set within masonry openings, these windows are part of a continuous aluminum-framed façade. They can be vented or fixed, offering natural ventilation and egress where required by code. Operable units are designed with sash profiles that fit into the larger framing grid, sealed with weatherstrips and equipped with hardware for smooth operation. Whether fixed or operable, curtain wall windows contribute to the building’s thermal performance through insulated glass units and low-emissivity coatings. Their seamless integration maintains the uniform exterior appearance that defines curtain wall architecture.