Greenhouse Vent Arm Window Opener Essential Automatic Autovent Lacewing

The autovent window opener is an all-in-one solution for greenhouse temperature control. Using a cleverly designed pressure system, the arm opens the window if the greenhouse is over a preset temperature, and closes the window below this temperature. Care for your greenhouse plants, even when you're not at home. - Manufacturers part number: GH0476

• Perfect for windows that weigh up to 7kg - opens nearly all greenhouse windows
• Mechanical system activated by heat - no electricity needed, which means no running costs
• Opens up to 35cm wide - opens wide to encourage air circulation
• Fully adjustable to open between 15°-20°C - set the temperature the window will open and close at to care for your specific plants and climate
• Automatically opens and closes window at preset temperature - increases air flow and relieves your plants in hot temperatures