| 摘要 |
An air filtering device removably attaches to the back or inlet side of the wire guard of a conventional portable desktop electric fan or the like, for filtering foreign matter from the ambient air in a room in which the fan is operating. The filter device comprises a filter element and solid shroud, with the shroud capturing the filter element between the back of the fan guard and the inner surface of the shroud. The filter element has a generally toroidal, tire-like shape, with the open inner annulus area providing access to the inner volume of the filter. The shroud is shaped similarly to the filter, but has only a single wall configured to fit about the back or inlet side of the fan guard. The shroud has an outer rim including attachments for securing the shroud to the outer periphery of the fan guard, and an inner annulus having a lip extending therefrom for securing one annulus of the filter thereto. The other annulus of the filter secures tightly about the fan motor housing, thereby precluding passage of any foreign matter past the filter and through the fan. One wall or panel of the filter is thus drawn against the back of the fan guard, with the other wall remaining against the inner surface of the shroud to define a debris capture pocket between the two walls or panels of the filter element. The filter element may be formed of either disposable or washable reusable materials as desired.
|
