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70mm*20mm 90mm*20mm Galvanzied Smooth Flat Duct Post Tension Corrugated Galvanized Flat Duct, Find Details and Price about Post Tension Flat Duct Post Tension Slab from 70mm*20mm 90mm*20mm Galvanzied Smooth Flat Duct Post Tension Corrugated Galvanized Flat Duct - JNFLEX (CHANGZHOU) CO., LTD.