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How does the automatic opening / self cooling work?

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Harvst mini greenhouses are fitted with wax based auto-vents, which open automatically when the temperature gets above 20 degrees C or so. The activation temperature is adjustable, by screwing the piston in and out of the mechanism. When the temperature drops again, the lids close, keeping your plants nice and cosy without getting too hot. Unlike standard greenhouses, which only have a small proportion of the roof opening automatically, the whole lid of a Harvst mini greenhouse opens up, allowing it to vent significantly more heat.

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