How do fire-resistant ducts and accessories improve overall fire resistance?
Publish Time: 2024-12-12
In the field of building fire safety, fire-resistant ducts and accessories play a pivotal role. They significantly improve overall fire resistance through multi-faceted synergy.The material properties of the fire-resistant duct itself are the basis. It is usually made of non-combustible or flame-retardant materials, such as galvanized steel plates, inorganic fiberglass, etc. These materials have a high melting point and thermal stability, and can withstand the direct baking of high-temperature flames without burning, deforming or being damaged when a fire occurs. For example, when a galvanized steel plate duct encounters a fire, its metal structure can remain intact for a certain period of time, preventing the fire from spreading to other areas through the inside of the duct.The connection accessories of fire-resistant ducts are crucial to the overall fire resistance. Special fire-resistant sealants and gaskets are widely used in the joints and interface parts of ducts. These accessories have good sealing performance at room temperature, which can prevent air leakage and ensure the normal operation of the ventilation system. Once they encounter a fire, they will expand and solidify rapidly, forming a tight fire barrier, effectively blocking the gaps that may allow flames and smoke to pass through, and preventing the fire from spreading between different fire zones.Fire control valves are also one of the key components. It can automatically adjust or close the air duct channel according to the temperature, smoke concentration and other conditions at the fire scene. When the high temperature caused by the fire causes the temperature sensing element of the control valve to operate, the valve will automatically adjust the opening to reduce the air supply to the fire area, thereby controlling the development of the fire. If the temperature continues to rise to the limit, the control valve will be completely closed, completely cutting off the ventilation path, preventing the flame from spreading to other unburned areas with the help of the air flow of the air duct, and buying precious time for personnel evacuation and fire rescue.In addition, some fireproof air ducts are also equipped with fireproof covering materials. These materials are mostly mineral wool, rock wool, etc. with good thermal insulation properties. They are wrapped around the outside of the air duct, further enhancing the air duct's tolerance to high temperatures. In a fire, fire-resistant coating materials can slow down the speed of heat transfer to the inside of the duct and reduce the rate of increase in air temperature in the duct. Even in a long-term high-temperature fire environment, they can ensure the relative stability of the duct structure and maintain its ventilation and fire protection functions.In summary, fire-resistant ducts and accessories cooperate with each other through high-quality materials, tight connection and sealing, intelligent adjustment and control, and effective coating and insulation, etc., to build a solid fire prevention line, greatly improving the overall fire protection performance of the building ventilation system in a fire, and providing strong support for protecting the lives and property safety of people in the building.
