We've found these Bayliss Automatic Greenhouse Vent Openers to be the best on the market and are suitable vents for both wooden or aluminum grenhouse windows and frames.

With the two of the most important aspects of successful greenhouse growing being adequate ventilation and preventing excessive temperatures, the Bayliss XL Greenhouse Autovents are invaluable as they react to changes in greenhouse temperature and open and close vents accordingly . Please note that although the Bayliss XL Autovent will fit the vast majority of greenhouses, some models of Halls and Robinsons may require additional fixings. We also recommend the Bayliss MK7 Autovent for use on any Alton greenhouse structure.

The Bayliss Mk7 Greenhouse Autovent is approximately 29cm long and will lift a vent weighing up to 6kg. It can be set to start opening at any temperature between 12°-25°C, giving a maximum opening of approximately 30cm.

3 new colours: White, Brown and Green

The MK7 Triple Spring Autovent uses the same mechanism as the MK7 but with two additional springs giving extra closing force. Ideal for top hinged side windows, light roof vents (like uPVC windows) or roof vents in very windy areas.

Bayliss MK7 Triple Spring Autovent Was £39.95 Now Only £34.95