When it gets hot the device opens the window the bottles go up. Bottles are used to close the window, as the window opens from the top and one spring is not enough to close it. The device can lift up to 7 kilograms, which is enough to lift bottles. I wrote a short review https://ismart.life/products/product/Greenhouse-Window-Opener
Automatic ventilation in my greenhouse. Made a small improvement with 2 bottles of beer. Works great.
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