They are the most suitable opening systems designed for PVC window and door systems. Not only do they open like a normal single opening, they also open from the top by moving to the ventilation position from the top of the wing. Double opening systems used in PVC Windows can be developed upon request. Additions such as burglar safety, double opening safety, gradual opening, additional locking can be made. They can be used in any width and height measure. Insulation values are excellent. They work without problems.
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