Unitized curtain wall system is an external building façade, usually aluminum-framed wall, containing in-fills of glass, aluminum spandrel panels, thin composite panels or concrete spandrel panels.
The framing is attached to the building structure and does not carry the floor or roof loads of the building. The wind and gravity loads of the curtain wall system are transferred to the building structure, typically at the floor line.
Unitized curtain wall system is composed of large units that are pre-assembled and glazed in factory before shipping to building site for installation. With unitized curtain wall forming the core component of the external envelope of the building, thermal efficiency, sound transmission and fire safety becomes the key performance criteria of the system.