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US 2003/0188520 A1Published application
Air filter system for a free-standing air blowing fan
OwnerPaul Boulvainventor
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OwnerPaul Boulvainventor
Estimating the term…
A filter system for a free-standing air blowing fan having a support stand, motor driven fan blades and a cage about at least portions of the blades, is described. The filter system comprises a filter support hub defined by a solid circumferential wall. The filter support hub is secured about or forms part of the cage. The hub is also provided with filter retention attachments rearwardly thereof for removable securement of a flat annular disc-shaped air filter behind the fan blades and cage. The filter support hub has a projecting air shield front edge projecting forwardly of a central planar axis of the fan blades of the fan to prevent ingress air flow from a front opened end of the filter support hub when the fan is operating. All the ambient air is accordingly drawn from the back through the filter.
A filter system for a free-standing air blowing fan having a support stand, motor driven fan blades and a cage supported about at least portions of said blades, said system comprising a filter support hub defined by a circumferential wall, said filter support hub and said cage being connected together, filter retention means associated with said filter support hub for removable securement of a flat annular disc-shaped air filter behind of said fan blades, said filter support hub having a projecting air shield front edge projecting forwardly of a central planar axis of said fan blades of said fan to prevent ingress air flow from a front open end of said filter support hub when said fan is operating whereby air is only drawn through the filter.
Dependencies are inferred from the claim text.