| 摘要 |
A one piece molded plastic foundation ventilator. The ventilator includes a one-piece continuous and structurally jointless plastic tubular member having a first through passageway, with the tubular member having a front and a rear, and with the through passageway of the ventilator including a portion between the front and the rear having a smaller cross-sectional dimension than the front, and having a smaller cross-sectional dimension than the rear. The front and rear of the ventilator includes outwardly directed flange portions. The ventilator may be supplemented by the addition of a screen and a hinged cover with securing latches.
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