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What material is good for smoke control and exhaust pipes?

It is best to use double-sided color steel modified phenolic composite duct for smoke control and exhaust, because the surface of double-sided color steel modified phenolic composite duct is coated with acrylic acid, which will not accumulate dust and breed bacteria. Moreover, the double-sided color steel modified phenolic composite duct can also reach A2 incombustible fire protection grade, and its thermal conductivity is also low. The best manufacturers in the market are Volkswagen, Merlot and other brands.