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About product and suppliers:
        Alibaba.com offers 389 manual air duct damper products. About 97% of these are hvac systems & parts, 1% are other furniture hardware. 

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

There are 389 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 174 with ISO9001, 119 with Other, and 15 with OHSAS18001 certification.