BETTER TOMORROW

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SUZHOO ZHAOHE

ZHAOHE’s spiral duct system is a quickly assembled system. The ductwork classification and air leakage limit of ZHAOHE’s spiral duct system is more than classic D according to <DW144>.The type of galvanized steel normally used for ductwork is DX51D and Z275.Seal moulding remains tight from 5000Pa negative to 3000 Pa positive pressure.Pre-insulated system uses glass wool as insulation which certified by GL and DNV.Pipe fittings are made by stamping, which ensured them beautiful appearance, low windage loss, good sealing effect.