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About product and suppliers:
        Alibaba.com offers 88,927 air duct products. About 35% of these are hvac systems & parts, 1% are pipe fittings, and 1% are metal building materials. A wide variety of air duct options are available to you, such as ventilation, hvac systems, and heating. You can also choose from free samples, paid samples. There are 88,190 air duct suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Japan, which supply 98%, 1%, and 1% of air duct respectively. Air duct products are most popular in Mid East, Domestic Market, and North America. You can ensure product safety by selecting from certified suppliers, including 27,402 with ISO9001, 13,452 with Other, and 7,034 with ISO14001 certification.
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