| 摘要 |
Air vent covers for attachment to crawlspace walls, over or into air vent openings, to enclose the air vent openings and seal them against the entry of air and humidity from the atmosphere into the crawlspace. The preferred air vent covers comprises rectangular panels molded from durable plastic composition, with a flat outer surface surrounded by a recessed peripheral border provided with holes for receiving attachment means for fastening the cover to a crawlspace wall. The preferred rectangular panels are also molded with a recessed inner surface surrounded by a projecting peripheral border, and the recessed inner surface is provided with projecting reinforcing ribs which extend across the width of the panels to reinforce the panels against warpage when they are fastened to the crawlspace wall. Alternatively, the vent covers may be hollow tubular elements of durable plastic sized to be frictionally-engaged within an air vent opening in place of an air vent to seal the crawlspace wall.
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