Greenhouse Automatic Window Opener from Hobby G

It is important to maintain a constant temperature in your greenhouse that suits your plants. You can adjust the temperature by opening and closing the windows but this can be difficult to do if you are not at home all day.

One solution to this would be to install automatic window openers on all the windows in your greenhouse. They can be adjusted to open and close within a temperature range between 16 and 25 degrees.

They operate by using the heat from the sun. As the black cylinder is heated the plantoil inside expands and pushes up a piston which opens the window. As the cylinder cools the piston closes the window.

An environmentally friendly solution. No need to use electricity. Remember to remove the cylinder during the winter otherwise it might suffer frost damage. Univent automatic window opener with double spring

• Aluminium
• Suitable for greenhouses with glass and polycarbonate
• With double spring which pulls the window shot
• Adjustable to open and closing between 16 and 25 degrees
• Opens the window up to 48 cm
• Can lift up to 7 kg
• Has a "click-system", which means that that it is easy to dismantle if for example a storm is coming