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About product and suppliers:
            3,690 roof ventilation fan products are offered for sale by suppliers on Alibaba.com, of which axial flow fans accounts for 27%, centrifugal fans accounts for 9%, and other ventilation fans accounts for 5%. 

A wide variety of roof ventilation fan options are available to you, 

There are 2,928 suppliers who sells roof ventilation fan on Alibaba.com, mainly located in Asia. The top countries of suppliers are India, China, and India, from which the percentage of roof ventilation fan supply is 1%, 96%, and 1% respectively.