Breathable windows, with their roots dating back to European royal palaces where they were initially installed at the lower sections of window frames before glass windows became prevalent, served to infuse interiors with fresh air and cherished sunlight while folding discreetly into the regal decor when not in use. In modern times, these windows are favored mainly for their ability to control light, enhance privacy, and serve as a high-end window dressing, enjoying widespread popularity particularly in Europe and America.

When it comes to varieties, breathable windows can be categorized based on their shapes and structures, such as rectangular (standard), arched, circular/semi-circular, bay, peacock-style, sliding doors, or French doors. They are also differentiated by their materials like wooden, plastic, bamboo, and aluminum alloy options.

The structure of a breathable window varies depending on its form and function. Typically, it comprises an outer frame, louvers, side frames, upper and lower rails, partitions, pull rods, T-columns, hinges, and other hardware components. For sliding door types, there are additional features like tracks and related attachments.

To choose the perfect breathable window, consider these expert tips:

1. **Tightness and Smooth Operation**: Assess whether the gaps between profiles and accessories are compact and if the sliding mechanism operates smoothly without noise. Poor-quality designs often lead to noisy and jerky movements.

2. **Use of Secure Pressure Steel Rivets**: Be sure that the manufacturer uses solid pressure steel rivets instead of regular ones. The latter may be used to cut costs but could result in loosening and potential detachment over time.

3. **Compliance with National Safety Standards**: Given the absence of a center frame in some designs, the glass used in the window must meet strict safety standards. Beware of manufacturers who use ordinary tempered or semi-tempered glass to reduce costs, compromising safety.

4. **Manufacturer Expertise and After-sales Service**: Ensure the manufacturer has a strong technical background, as the design, production, and installation of breathable windows demand high expertise. This is especially critical for complex installations, such as uneven balconies. Furthermore, a comprehensive after-sales service is a cornerstone guaranteeing the quality and longevity of your purchase.