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About product and suppliers:
        Alibaba.com offers 336 manual air duct damper products. About 100% of these are hvac systems & parts, 2% are valves, and 1% are other furniture hardware. 

A wide variety of manual air duct damper options are available to you, such as hvac systems, ventilation, and air conditioning. You can also choose from free samples, paid samples. 

There are 336 manual air duct damper suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of manual air duct damper respectively. 

Manual air duct damper products are most popular in Domestic Market, Western Europe, and North America. 

You can ensure product safety by selecting from certified suppliers, including 153 with ISO9001, 84 with Other, and 14 with ISO14001 certification.