| Produced by jointing coils by means of a "lock seam 4p" method, the product demonstrates added intensity and elasticity as well as high resistance to outside pressure. Light weight and durable, it is remarkably easy to process and handle. We manufacture these ducts in large quantities at out facility to aid in the early completion of difficult installation work. Nowadays, it is widely used to enhance efficiency in building heating, ventilation and air conditioning. | 
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