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Lacewing™ Essential Automatic Vent Arm Window Opener / Autovent

Spring Clearance - Up to 60% Off
Special Price £17.99 Original £24.99 You save 28%
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Lacewing™ Essential Automatic Vent Arm Window Opener / Autovent

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.

All greenhouses need to be well ventilated on hot and sunny days to keep plants in optimum growing conditions. The automatic vent arm uses captured gas which expands in hot temperatures, opening the window without any running costs. The simple but smart mechanism will maintain optimal temperatures at all times, whether you are or aren't at home. You can adjust the opening temperature between 15° and 20°C to suit your individual needs. Simply install the vent opener by using the instructions and let it do its job.


  • Automatically opens and closes window at preset temperature - increases air flow and relieves your plants in hot temperatures
  • 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
  • Opens up to 35cm wide - opens wide to encourage air circulation
  • Mechanical system activated by heat - no electricity needed, which means no running costs
  • Perfect for windows that weigh up to 7kg - opens nearly all greenhouse windows
  • Chrome coated metal - increased corrosion resistance
  • Length: 32cm (1ft ½in) x Depth: 5cm (1¾in) x Height: 4cm (1½in)
  • Max. opening width: 35cm (1ft 5⅔in)
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Installing a Vent Arm

Style Accessories
Sale Category Greenhouses
Spring Checklist Greenhouses
Shop By Category Awnings