First, the main profile: since frameless balcony windows have no visible frames, their structural support comes mainly from the top and bottom aluminum profiles. In areas like Xiamen, where typhoons are common, these profiles must be thick enough—ideally 3mm. Some manufacturers use thinner options like 2.0 or 2.5mm, which can compromise safety. Also, it's important that the material is produced in Shanghai, as Guangzhou-made profiles often have a poor finish and may not meet the actual thickness requirements.
Second, the glass: it should be specially tempered glass from Dachang with 3C certification. Many small shops might use regular or semi-tempered glass, which is not safe and could break easily, posing serious risks.
Third, the hardware: especially the wheels. It’s better to choose stainless steel bearing wheels with noise reduction features rather than nylon ones. Nylon wheels tend to wear out quickly, become rough, and may even break, causing the window to fall down unexpectedly, which is very dangerous.
Fourth, craftsmanship: frameless balcony windows are custom-made, so the production process requires high precision. The skill of the technician is crucial. You need an experienced professional for both manufacturing and installation to ensure smooth operation, good appearance, and long-lasting quality. After installation, it’s wise to inspect everything carefully before making the final payment.
Fifth, credibility: last but not least, always go with a reputable and experienced manufacturer. Direct sales are ideal, as they can offer better prices. Although building materials stores may seem safer, they often charge more. By doing some research online and finding direct manufacturers (many brand products sold in stores are actually made by these companies), you can save at least 40%. Finding such suppliers is easy through online searches and is definitely worth the effort.
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