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SOLAR CHIMNEY: A Ventilator for Greenhouses It harnesses the heat of the sun for a chimney 2 feet square rising 12 feet above the greenhouse roof, painted black on the inside except for the south exposure which is glazed, with a trap at the base which is level with the roof and which opens when an updraft is caused by the sun heating the chimney; the hotter the temperature, the greater the updraft; all details, refer to AU84-11 0

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