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Fire-resistant board ducts are mainly used in the smoke exhaust system and air conditioning ventilation system of the basement. What materials are generally used for fire-resistant ducts?
1. Galvanized iron sheet fireproof coated ducts: This material has a simple manufacturing process and good fireproof performance, but it is difficult to install, has a large deadweight, and is easy to break.
2. Steel insulation and smoke exhaust ducts: It is very convenient to install, light weight, easy to rust, poor high temperature resistance, and will produce harmful gases after burning.
3. Double-sided color steel glass wool: light material, good fireproof, but there are safety hazards.
So how to choose refractory materials?
1. According to refractoriness
When choosing refractory materials, you must first look at the refractoriness. The refractoriness is divided into different grades, including ordinary, advanced and special grades. If you choose a fire-resistant duct, you should try to choose a special grade refractory material to avoid combustion and explosion of the duct and danger.
2. Choose according to chemical properties
Refractory materials have three different chemical properties. You must choose according to their chemical properties, otherwise chemical reactions will occur in high temperature environments, causing material damage.
3. According to the purpose
There are many types of refractory materials, and different types are used in different occasions and for different purposes. For example, steel refractory materials can be used in steelmaking, non-ferrous metal refractory materials are used in metallurgy, and silicate refractory materials are used in glass kilns and cement kilns.