2. Key performance requirements

2.1 General

European standard NF EN 13659 specifies the performance requirements for window and door closures. Minimum performances are not necessarily required for all characteristics: classifications are sometimes defined to enable product comparison.

2.2 Wind resistance

The wind resistance of window closures is probably the most important feature of these products, at least from a safety point of view.

Standard NF EN 13659 defines a classification based on the pressure...