| 摘要 |
A mechanical device used to substitute the natural or light material curtains, which are applied so far to prevent the cold air from entering the cultivated areas (situated in very low slope lands) protected from the effects of the radiation frosts by means of the selective drainage of cold air. The referred device put in motion a cold air flow, taken from the ground proximities during frost nights, and impels it producing a jet with an approximately horizontal axe and a circular sector geometry viewed from top.
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