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Insulated saj zawg zog Aluminium cua duct yog tsim los ntawm lub raj sab hauv, rwb thaiv tsev thiab lub tsho. 1. Inner tube: yog ua los ntawm ib daim ntawv ci los yog ob, uas yog spirally mob nyob ib ncig ntawm siab elastic steel hlau; Cov ntawv ci tuaj yeem yog laminated Aluminium ntawv ci, aluminised PET zaj duab xis lossis PET zaj duab xis. Thib...Nyeem ntxiv»