Description: 【Metal Material】Automatic Greenhouse Vent Opener is made of metal, rust resistant and sturdy structure 【No Electric Power Needed】automatically open or close the greenhouse vents as temperature rises or drops, ranging from 15°C to 25°C, which helps prevent overheating or low temperatures, ensuring your plants thrive 【Easy Installation】This automatic window opener can be easily assembled and disassembled. It fits seamlessly into all standard greenhouses and garden sheds, making it a versatile choice for various setups including breeding greenhouses, flower houses, tunnel greenhouses, and fruit shelters 【Specifications】 The maximum opening height of the window is 45cm/17.72inch with a weight capacity of up to 15 kg for the venting windows 【Feature】This automatic window opener with double spring type operates solely on temperature fluctuations, providing a nice solution for maintaining proper ventilation in your greenhouse Package Includes: 1 Greenhouse Window Vent Opener Kit Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.