Una contraventana, puertaventana o postigo es una pequeña puerta exterior incorporada a la ventana mediante bisagras que tiene funciones parecidas a la persiana: impide el paso de la luz o el calor además de proteger la ventana. Los materiales más comunes de fabricación de las contraventanas son los siguientes: \n* PVC \n* Aluminio \n* Madera tratada Por su estructura, las contraventanas pueden ser: \n* Opacas \n* De lamas fijas \n* De lamas móviles, que se activan por un mecanismo que las inclina en dos posibles sentidos \n* También pueden ser de una sola hoja o de varias hojas plegables

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A window shutter is a solid and stable window covering usually consisting of a frame of vertical slats and horizontal rails (top, centre and bottom). Set within this frame can be louvers (both operable or fixed, horizontal or vertical), solid panels, fabric, glass and most any other item that can be mounted within a frame.Shutters may be employed for a variety of reasons, including controlling the amount of sunlight that enters a room, to provide privacy, security, to protect against weather or unwanted intrusion or damage and to enhance the aesthetics of a building. Depending on the application, and the construction of the window frame, shutters can be mounted to fit within the opening or to overlap the opening. The term window shutter includes both interior shutters, used on the inside of a house or building, and exterior shutters, used on the outside of a structure. On some styles of buildings it is common to have shutters to cover the doors as well as the windows.

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