automatische raamopener dubbele veer Man strong and resistant to knocks

strong and resistant to knocks and weather conditions

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automatische raamopener dubbele veer Man strong and resistant to knocksThe automatic roof window opener with double spring regulates the ventilation of your greenhouse window fully automatically, without you having to keep checking it yourself. The system works with a cylinder filled with special wax that reacts to temperature: when it gets warmer in the greenhouse, the window opens; when it cools down, the window closes again. This keeps the climate in your greenhouse better balanced, even when you are not there. It is