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Established 1975 A Trusted Brand
Made In Britain Homegrown Company
Safe & Secure Feel Confident as You Shop
Established 1975 A Trusted Brand
Made In Britain Homegrown Company
Safe & Secure Feel Confident as You Shop

Automatic Greenhouse Window Opener

Our automatic greenhouse window openers for your roof vents are a must and are also available for fitting to louvre vents. Automatic greenhouse window openers overcome the problems of rapid changes in weather conditions - they react to the heat so that vents are opened when temperatures increase, without you having to be there. The best-known automatic vent openers on the market are Bayliss Autovents which have been manufactured for over 40 years. These automatic greenhouse window openers can be used on both wooden greenhouses and aluminium greenhouses. Fitting greenhouse window openers to roof vents and louvre windows means that you don't have to try to predict the weather conditions - these greenhouse window openers simply react to the temperature, opening vents when temperatures increase, and closing them when temperatures fall.
  • Bayliss XL Vent Opener

    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99

    For roof vents weighing up to 12lbs, approx.30" x 24" (76cm x 61cm). Can be clamped onto aluminium greenhouses - no need for any drilling. If a mor...

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    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99
  • Replacement Power Cylinder for MK 7 Range

    Original price £19.99 - Original price £19.99
    Original price
    £19.99
    £19.99 - £19.99
    Current price £19.99

    Easy to fit. This cylinder is filled with a wax that expands in warm temperatures - it can be set to start opening from around 12*C / 55*F up to 75...

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    Original price £19.99 - Original price £19.99
    Original price
    £19.99
    £19.99 - £19.99
    Current price £19.99
  • Bayliss MK 7 Vent Opener

    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99

    Bayliss guarantee their openers for 2 years but if anything should go wrong after that replacement cylinders are readily available and easy to fit....

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    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99
  • Bayliss XL Vent Opener in Black

    Original price £25.99 - Original price £25.99
    Original price
    £25.99
    £25.99 - £25.99
    Current price £25.99

    This reliable vent opener works by a wax within the cylinder of the opener expanding when it's hot, pushing a piston to open the window. When it co...

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    Original price £25.99 - Original price £25.99
    Original price
    £25.99
    £25.99 - £25.99
    Current price £25.99
  • Replacement Cylinder For XL Vent Opener

    Original price £18.99 - Original price £18.99
    Original price
    £18.99
    £18.99 - £18.99
    Current price £18.99

    Dimensions: 8ľ" (22cm) long body. For roof vents weighing up to 12lbs, approx.30" x 24" (76cm x 61cm). Exerts a load of 11lbs (5Kg) i.e. it will l...

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    Original price £18.99 - Original price £18.99
    Original price
    £18.99
    £18.99 - £18.99
    Current price £18.99
  • Triple Spring Bayliss MK 7 Vent Opener

    Original price £41.99 - Original price £41.99
    Original price
    £41.99
    £41.99 - £41.99
    Current price £41.99

    For side windows up to approx.36" x 24" (92cm x 61cm). Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached...

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    Original price £41.99 - Original price £41.99
    Original price
    £41.99
    £41.99 - £41.99
    Current price £41.99
  • Automatic Roof Vent Opener for Palram Canopia

    Original price £61.00 - Original price £61.00
    Original price
    £61.00
    £61.00 - £61.00
    Current price £61.00

    Fully Automatic - Opens your roof vent as the temperature rises maximising ventilation and air circulation. Fully Adjustable - Has an adjustable ...

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    Original price £61.00 - Original price £61.00
    Original price
    £61.00
    £61.00 - £61.00
    Current price £61.00
  • Auto Louvre Opener for Palram Canopia Greenhouse

    Original price £87.00 - Original price £87.00
    Original price
    £87.00
    £87.00 - £87.00
    Current price £87.00

    Easy to fit - Designed specifically to fit the Palram Canopia Louvre Window. Automated - Automatically opens the louvre window, it also has a rel...

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    Original price £87.00 - Original price £87.00
    Original price
    £87.00
    £87.00 - £87.00
    Current price £87.00
  • Super Bayliss MK 7 Vent Opener

    Original price £99.99 - Original price £99.99
    Original price
    £99.99
    £99.99 - £99.99
    Current price £99.99

    For large roof vents weighing up to 35lbs.  Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached by wood sc...

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    Original price £99.99 - Original price £99.99
    Original price
    £99.99
    £99.99 - £99.99
    Current price £99.99
  • Bayliss MK 7 Hydraulicheck Vent Opener

    Original price £65.99 - Original price £65.99
    Original price
    £65.99
    £65.99 - £65.99
    Current price £65.99

    For roof or side windows in severely exposed positions weighing up to 14lbs, approx.30" x 30" (76cm x 76cm).  Bolts on to aluminium greenhouses (fi...

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    Original price £65.99 - Original price £65.99
    Original price
    £65.99
    £65.99 - £65.99
    Current price £65.99
  • Replacement Cylinder for MK 7 Super Vent Opener

    Original price £43.99 - Original price £43.99
    Original price
    £43.99
    £43.99 - £43.99
    Current price £43.99

    Unique, ultra strong, finned aluminium cylinder with both internal and external finns - this gives a more efficient heat exchange between the wax i...

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    Original price £43.99 - Original price £43.99
    Original price
    £43.99
    £43.99 - £43.99
    Current price £43.99
  • Bayliss MK 7 Orchid House Vent Opener

    Original price £44.99 - Original price £44.99
    Original price
    £44.99
    £44.99 - £44.99
    Current price £44.99

    Designed for aluminium or timber framed vents measuring up to 60cm square (2ft square) lifting a load of up to 6kg (14lbs). Provides a maximum open...

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    Original price £44.99 - Original price £44.99
    Original price
    £44.99
    £44.99 - £44.99
    Current price £44.99
  • Cylinder & Washer to fit Orchid Opener

    Original price £21.45 - Original price £21.45
    Original price
    £21.45
    £21.45 - £21.45
    Current price £21.45

    Easy to fit. This cylinder is filled with a wax that expands in warm temperatures, it can be set to start opening from around 75*F up to 90*F. Le...

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    Original price £21.45 - Original price £21.45
    Original price
    £21.45
    £21.45 - £21.45
    Current price £21.45