In our daily lives, although noise pollution is intangible, its harm to people's physical and mental health is multifaceted. It can lightly affect living and production environments, reducing quality of life and work efficiency; severely, it can impact the human endocrine system, cardiovascular system, and nervous system, etc. Prolonged exposure to high noise pollution environments can pose significant health risks.

　　With the strengthening of environmental awareness, people's demands for the quality of production and living environments are increasing. In recent years, duct products have been recognized as useful and beneficial parts in solving noise problems in residential, commercial, and industrial buildings. Ducts can transport cold and hot air from central heating, ventilation, and air conditioning (HVAC) equipment to spaces occupied by people, but traditional ducts not only generate noise during operation but also have formaldehyde issues.

　　To address the issues of high mechanical strength, low material costs, and poor sound insulation of traditional ducts, Beijing Hanjing New Materials has independently developed and produced a series of formaldehyde-free soundproof duct products, including formaldehyde-free reinforced soundproof ducts, formaldehyde-free environmentally friendly soundproof ducts, and formaldehyde-free assembled soundproof ducts.

　　Regarding the performance of formaldehyde-free soundproof ducts, we can understand it from aspects such as environmental protection, noise reduction, thermal insulation, mold prevention, and fire resistance.

　　01 Environmental Performance

　　The environmental performance here refers to the fact that formaldehyde-free soundproof ducts do not contain formaldehyde. The outer layer of the duct is made of galvanized steel plate, and the lining is made of formaldehyde-free environmentally friendly glass wool board, both of which do not contain formaldehyde.

　　Among them, the environmentally friendly glass wool board adjusts the formula and improves the production process based on traditional centrifugal glass wool, using formaldehyde-free silicone resin as a binder to combine, solidify, and shape the raw materials of glass wool. It completely eliminates toxic and harmful substances such as phenol, formaldehyde, and urea, ensuring fresh and pollution-free air, reducing environmental pollution, and providing ideal ecological and health benefits.

　　02 Noise Reduction Performance

　　The sound absorption and noise reduction performance of formaldehyde-free soundproof ducts mainly comes from the glass wool board lining inside the duct. After the board is formed, it creates many small holes. When sound encounters these small holes, it enters the internal structure of the duct through the holes and is well absorbed, thereby reducing noise in the ventilation system and minimizing sound wave rebound, providing people with a quiet and comfortable indoor space.

　　03 Fire and Mold Prevention

　　The role of formaldehyde-free soundproof ducts in fire resistance and thermal insulation is also significant. Our products have undergone fire resistance performance testing by professional institutions and are classified as A-level non-combustible fire materials, with fire resistance limits that can meet various time requirements.

　　In addition, the glass wool board on the inner wall of the duct not only does not corrode the duct during use but also adds a layer of white antibacterial mesh cloth, giving this duct product mold prevention and antibacterial properties. After installation and use, the duct can reduce later maintenance costs while providing a healthy and environmentally friendly office, recreational, and travel environment.