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Soundproof windows – architectural barriers that go beyond just “quiet”
When residents along Yexin Highway in Fengjing Town were repeatedly awakened by freight noise, a soundproof window reduced their nighttime noise from 70dB to 30dB (library-level quiet). Modern soundproof windows have evolved into a comprehensive solution of "quietness + energy saving + safety," with their five major performance characteristics -sound insulation, wind resistance, water tightness, air tightness, and thermal insulation- working together to redefine building comfort.
Sound insulation: an acoustic barrier that isolates noise.
Definition and core values
Sound insulation measures the ability of doors and windows to reduce sound wave transmission. The core indicator is STC (sound transmission level) . Ordinary windows have an STC of about 25dB, while high-performance soundproof windows can reach 35-45dB. Research by the World Health Organization shows that long-term exposure to environments with STCs above 60dB can increase the rate of insomnia by 40%, while high-performance soundproof windows can reduce street noise to below 35dB.
Technical Indicators and Influencing Factors
• STC vs. OITC : STC is suitable for mid-to-high frequencies (conversation), while OITC is for low frequencies (traffic/subway). For residential buildings facing the street, it is recommended to choose products with OITC ≥ 35dB.
• Glass configuration : Double/triple tempered glass is available. Vacuum glass blocks sound waves through the vacuum layer, and laminated glass (PVB film) absorbs low-frequency vibrations. The triple-glass, double-cavity design can achieve full-frequency sound insulation.
Sanyuan Environmental Ventilation and Soundproof Window
Sanyuan Environmental Ventilation and Soundproof Window
Wind resistance: the cornerstone of safety for high-rise buildings
Definitions and Classification Standards
Wind resistance measures a door's and window's ability to withstand wind pressure deformation. The national standard classifies it into 9 levels, with level 9 (≥5000Pa) capable of withstanding a category 12 hurricane. High-rise buildings should choose products with a wind resistance level of ≥7, while coastal areas are advised to choose level 9 plus a typhoon-proof locking system.
Key technologies
• Profile structure : Multi-cavity thermally broken aluminum profile (wall thickness ≥ 1.8mm) enhances rigidity, and the reinforced mullion design controls deflection ≤ L/200.
• Hardware system : 304 stainless steel hinges + anti-fall device to ensure that the window sash will not fall off in strong winds.
Watertightness and airtightness: a dual barrier against water and energy consumption
Water tightness
• Classification : Level 6 (≥600Pa) can withstand 500L/(㎡·h) rainstorms. This is mandatory for rainy areas in the south.
• Design highlights : Concealed drainage channel + EPDM rubber strip (50-year aging resistance) + weather-resistant sealant to form a waterproof system.
airtightness
• Energy saving : An 8-level airtight window (q1≤0.5m³/(m·h)) saves 1,500 yuan in electricity costs per year compared to a 5-level window, while also reducing sound leakage through gaps by 3-5dB.
Thermal insulation: the core of keeping you warm in winter and cool in summer
The heat transfer coefficient K-value is a key indicator. In northern regions, it is recommended that K ≤ 1.8 W/(㎡·K) (vacuum glass), and in southern regions, K ≤ 2.8 (double-glazed). Low-E coated glass can filter 90% of ultraviolet rays. Combined with multi-cavity profiles, it can increase the indoor temperature difference by 4-6℃ in winter compared to traditional windows.
Sanyuan Environmental Engineering Case Studies and Selection Guide
Typical Case
Overview of noise control on Lanzhou Railway
Overview of noise control on Lanzhou Railway
• Noise control for Lanzhou Railway : Vacuum composite glass (sound insulation 45dB) was used, reducing indoor noise from 93dB to 35dB.
Overview of Traffic Noise Control in Panyu District, Guangzhou
Overview of Traffic Noise Control in Panyu District, Guangzhou
• Traffic noise control in Panyu District, Guangzhou : Laminated insulated glass + level 9 wind-resistant profiles + ventilators, satisfying the three major functions of ventilation + sound insulation + smog removal , simultaneously solving noise and high-rise safety issues.
Key points for purchasing
1. Select according to needs : for street-facing buildings, choose a sound insulation of ≥40dB; for high-rise buildings, choose a wind resistance of ≥7 levels; and for northern regions, choose a thermal insulation K≤1.8.
2. Tips to avoid pitfalls : Check the test report (five properties data), avoid the "vacuum glass is a panacea" theory, and pay attention to the material of the sealing strip (EPDM is better than PVC).
In the future, soundproof windows will develop towards a "balance of five aspects." Choosing a good window is not only a requirement for quietness, but also a comprehensive investment in safety, energy conservation, and comfortable living.