The product is rounded Flange type of YB28 (D-B) Model and it is designed for easy and fast installation to the Duct. In addition, the product uses union type fastening Nut coupled to the both ends of the flexible joint to connect it to the Main pipe and Mounting Block in narrow space in order to improve hard installation of traditional product. this Model has 8-layer special gas intercept apparatus to prevent inflow of gas in duct. This product is approved by F.M.
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