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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

Bayliss Autovents

Bayliss, based in Ashbourne in the UK, has been manufacturing their Bayliss Autovents since 1964 they are a family business with an excellent reputation for the quality and reliability of their products.

The basic principle of all the Bayliss Autovents is the same, within each auto vent, is a strong metal power cylinder that contains a mineral wax that expands with the heat. This cylinder pushes a piston, opening your greenhouse window.

So as the temperature rises the window automatically opens, as the temperature falls, the window closes.

The Bayliss Autovents are made from stainless steel, brass and aluminium. Designed to provide you with many years of service, our selection of Bayliss Autovents is a sure way of enhancing your greenhouse-growing experience. Why not check out our greenhouse ventilation products which provide even more selection for your greenhouse ventilation needs?
  • 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
  • Bayliss Automatic Louvre Opener

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

    Temperature adjustable - you can set the opener to start opening the louvre from 15-18*C, with a maximum opening at approximately 30*C. Easy Fitti...

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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
  • 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