An earlier type of centrifugal fan. It had no external casing, but delivered directly to the atmosphere all around its periphery. The veins were curved backwards in the direction of rotation and the air was led into the fan by a curved inlet passage or throat. It was usually driven by steam at about 70 rpm; efficiency about 40%; external diameter of about 30 ft (9.1 m). See also: Sirocco fan Source: Dictionary of Mining, Mineral, and Related Terms
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