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Ultimate Ducting Guide - Ultimate Ducting Guide
Sun Apr 20, 2003 | 11:30A| PermaLink
Reducing ducts make the fan work harder, so ducts that reduce too much are ineffective and noisy. For example, a 120 to 60mm duct is not recommended. Ducts tend to be most useful when the area of the wide end is about twice the area of the smaller end, such as 80 to 60 mm, and 120 to 92mm. Case fan ducts are most effective when they are straight and unrestricted, any curves or corners should be as shallow as possible, and the walls of any duct must always be as smooth as possible, rough edges create turbulence, which slows the air down. You can put a fan at each end of a duct if it is long and restrictive, but both fans must be the same CFM rating. This kind of duct is very useful for bringing fresh outside air into the middle of the case.

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