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1. see the main sections: the main beam of wall thickness and material description (because all components form a borderless veranda eat last beams), profiles and accessories does tight coordination between, whether smoothly when moved. Quality and design is not good balcony window, move the window sash tend to have greater noise, feeling not smooth.

2. look at the accessories do you use safe solid pneumatic steel rivets. Some manufacturers to reduce the cost of using ordinary steel rivets, this will cause the frameless balcony use over time on the loose, even shedding. There are also mobile wheels, to see its ■ plastics components and axis of quality, whether inside the bearing. 3. look at the glass is national

3 c compulsory safety certification and glass primitive.　　 As borderless veranda window no intermediate lap box, which require a high level of glass, and some manufacturers in order to reduce costs in respect of the use of ordinary glass, reduces the cost per square meter of 30-60 above.

4. watch manufacturers is a one-stop service (business, measurements, design drawings, installation and after-sales service), is there a certification, some manufacturers do not have their own professional teams, only a few of the salesman. Orders after transfer to someone else to do, this product is no quality assurance and credibility.

5. to see whether the professional manufacturers of technology up to the mark and after-sales service