Slots in fan housing to reduce tonal noise

Details Slots in fan housing to reduce tonal noise Slots in fan housing to reduce tonal noise

2006-12-14

2010-02-09

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

Reexamination Certificate

active

07658592

ABSTRACT:
A fan housing is provided with slots formed in the enclosure of the fan housing. The slots are sized appropriately to filter the noise generated during operation of the cooling fan; e.g., tonal noise produced by the rotation of the blades. The slots may either be vented to the outside of the enclosure or closed off.

REFERENCES:
patent: 4086022 (1978-04-01), Freeman et al.
patent: 5409352 (1995-04-01), Lin
patent: 5896917 (1999-04-01), Lemont et al.
patent: 6773239 (2004-08-01), Koczo
patent: 7210905 (2007-05-01), Lapworth

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