| 摘要 |
An apparatus is disclosed for an improved device for covering an aperture disposed on a horizontal surface. The cover has sidewalls, a top surface, and a lip which defines a cover opening within a sidewall. The improvement comprises a first and a second guide rail extending from the cover and disposed on opposed first and second sides of the cover opening. A slot is defined in the cover and disposed along a third side of the cover opening. A frame defines a screened window and includes fastener projections which extend outwardly from the frame. The frame is inserted within the slot with a first and a second side of the frame being guided by the first and second opposed guide rails. The fastener projections engage the lip of the cover opening for retaining the frame and the screened window within the cover opening.
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