Completely automatic, works without batteries and electricity. The principle of work is based on heating from the sun of liquid in a hydraulic cylinder. the cylinder tears off a window leaf of your greenhouse. With sunset, at decrease in temperature in the greenhouse, the window leaf is closed.
It is developed for installation in a roof window leaf for any greenhouse. Installation is simple and can be executed independently.
Temperature of opening/closing of a window leaf: 16-25os.
Maximum weight of a window leaf: 100 kg.