Thread: cpu 120mm fan?
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Old 16th April, 2005, 10:10 PM
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Quote:
Originally Posted by GrahamGarside
any fan making claims of less than 15db is just plain lieing.
db yes there lieing, db(a) however perhaps not depending on the frequency because of the 'a' weighting curve.

See, http://www.phys.unsw.edu.au/~jw/graphics/dBA&C.GIF

As for a duct keep the rate of contraction under 10degrees (5 deg per side in 2d view) to minimise pressure difference
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