Abstract
Apparatus for the abatement of noise from cooling fans primarily in computer and business equipment. Noise of mechanical origin is reduced by damping the fan casing, by mass-loading the casing (at low frequencies), by isolating the casing from its surrounds, and by absorbing some of the noise as it is radiated from the fan casing. The foregoing functions are accomplished by a three-part assembly comprising an elastomeric damping-absorption-isolation collar, a massive high inertia collar, and a secondary isolator, which are inserted between the fan and its supportive structure. The assembly also supports the fan without loose fasteners attached to the fan.
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