50mm casement window system

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Advantage of Eeconomic solution 50mm casement window series.  

1. Material saving : compare with 60mm window frame and sash , 50mm window frame and sash saving 20% PVC profiles and steel reinforcement.
2. More light : For small window , if use big profiles , less glass space and get less light, 50mm with small section , makes room more bright.
3. Good appearance: Round corner design ,  looks smooth and peacefful.
4. Easy to install : Less weight  easy to move and installation.
5. Easy to open and close , more easy than 60mm series
6. Saving , but not loss any function .