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https://www.ms-viscom.com/wp-content/uploads/2025/07/Gewaechshaus_Glory_Automatischer_Seitenlamellenfensterroffner_1_Palram.jpg800600Automatic louvre window opener The automatic louvre window opener is designed for temperature regulation and provides additional ventilation for all Palram greenhouses. When the air inside the greenhouse warms up, the vent will gradually open to allow the correct amount of air to enter, and it will close once the optimal temperature is reached.