They are PVC window and door systems consisting of two wings that can be opened to large areas and the view is not divided when opened. One of the wings opens to the right and the other to the left. The one that closes before the wings and then opens is called the passive wing. Passive wings work like single expansions. They contain differences according to the way they are fixed. It has different applications such as cartridge slider, double arm, adapter espagnolette. The active sash can be operated with any of the other PVC window and door applications, optionally. Whichever wing to be used more is active, it would be correct.
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