| 摘要 |
A ventilating construction, such as for a cold frame or for other desired structures, and method of making the same are provided, the ventilating construction comprising a sheet of material having an opening therethrough a flap hinged to the sheet for opening and closing the opening. The sheet comprises two like walls of polymeric material disposed in spaced apart substantially parallel relation with a plurality of spaced apart substantially parallel ribs of polymeric material disposed between the walls and interconnected thereto. The flap comprises a section of the sheet cut therefrom to define the opening and having at least part of one edge thereof being uncut so as to be integral and one-piece with one of the walls to provide a natural hinge therewith.
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