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About product and suppliers:
        Alibaba.com offers 3,351 round duct size products. About 75% of these are hvac systems & parts, 1% are metal building materials, and 1% are other heat insulation materials. A wide variety of round duct size options are available to you, such as ventilation, hvac systems, and air conditioning. You can also choose from free samples, paid samples. There are 3,351 round duct size suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Japan, and Philippines, which supply 99%, 1%, and 1% of round duct size respectively. Round duct size products are most popular in Domestic Market, Southeast Asia, and North America. You can ensure product safety by selecting from certified suppliers, including 834 with ISO9001, 369 with Other, and 236 with ISO14001 certification.
        
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