1). It is an outward opening system,

2). The best benefits are energy saving and sound insulation;

3). The design of three chambers enhance the thermal and sound insulation of the profile;

4). It  accords with the RAL standard, the visible sidewall thickness 3mm, and has high strength of welding corner and resistance of impact;

5). The design of sloped rebate of inside chamber makes the drainage smoother;

6). The lock is fixed on the reinforcement by screw directly, which raises the safety of the windows against the theft;

7). It can deploy single or insulating glass with different thickness from 4mm to 32mm.