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.
• Bayliss XL Autovent can be simply clamped onto aluminium greenhouses without any drilling • Alternatively, bolt on using existing holes or drilled holes • Bayliss XL Greenhouse Autovent is 28cm long and will lift a vent weighing up to 5.5kg, or a vent approximately 61cm x 76cm (24" x 30") • Opens approx 30cm • Supplier offers 2 year guarantee on replacement cylinders but they should last approximately 6-10 years • Additional fixings (not supplied) may be required for fitting to some Halls and Robinsons models
What The Experts Say...
"If you haven't already got automatic openers installed for your greenhouse windows, fit some straight away. Automatic openers work by wax within their cylinder expanding when it's hot, pushing a piston to open the window and contracting in cooler temperatures to close the window again. Worth the investment to free yourself from being controlled by the vagaries of British weather - no more trips to the greenhouse to open and close windows manually every time the weather changes!" Buyers' Guide, Garden News, 18 June 2008
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
• Replacement Cylinders available
• Our supplier gives a 2 year guarantee on all replacement cylinders although they should last 6-10 years • Important to ensure that each cylinder is fitted exactly parallel to the window to avoid excess pressure on seal • Will fit all greenhouses except Robinsons brand "Don't let your plants suffer in the coming summer heat. This automatic vent opener for the greenhouse allows air to circulate and, as the temperature changes during the day, it automatically opens and closes. This model is suitable for both aluminium and wooden framed greenhouses." 'Great Value Garden Gear', Garden Answers, March 2008
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
• Available in Silver and White • Opens approximately 30cm • Supplier offers 2 year guarantee on all replacement cylinders but they should last approximately 6-10 years • Automatic openers work by wax within their cylinder expanding when it's hot, pushing a piston to open the window and contracting in cooler temperatures to close the window again