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Fan assemblies

  • US 3,947,148 A
  • Filed: 11/26/1974
  • Issued: 03/30/1976
  • Est. Priority Date: 12/27/1973
  • Status: Expired due to Term
First Claim
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1. A fan assembly comprising a duct, an axial flow fan located within the duct and including rotor blades having outer tips, the wall of the duct having a plurality of radial apertures circumferentially spaced around at least the part of the duct encircling the fan, an acoustic absorption material encircling said part of the duct and having projecting portions extending radially inwardly through the apertures into the duct towards the fan axis, the projections terminating in radially inwardly directed end faces which lie in the path of rotation of the periphery of the fan in a manner to provide a minimum clearance between the projections and the tips of the rotor blades of the fan.

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