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Automatic Greenhouse Opener

Automatic Openers for roof vents are a must and are also available for fitting to louvre vents. Automatic 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 openers can be used on both wooden or aluminium greenhouses. Fitting automatic openers to roof vents and louvre windows means that you don't have to try to predict the weather conditions - these automatic openers simply react to the temperature, opening vents when temperatures increase and closing them when temperatures fall.

Bayliss XL Vent Opener
This Bayliss XL is an extremely reliable automatic vent opener.
The opener is activated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener.


Bayliss MK 7 Vent Opener
Suitable for use on nearly all greenhouses this Bayliss MK7 is an extremely reliable, British made, automatic vent opener.
The bayliss Mk7 vent opener is operated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener.


Triple Spring Bayliss MK 7 Vent Opener
This Bayliss MK7 Triple Spring is an extremely reliable automatic vent opener.
This particular unit is designed to be fitted to top hinged, side windows or exposed roof vents, the three springs fitted are designed to hold the windows / vents firmly in place in windy conditions, and with the extra springs, to exert a greater closing force.


Bayliss MK 7 Hydraulicheck Vent Opener
An extremely reliable automatic vent opener with unique features.
The Bayliss Hydraulicheck Vent Opener has a small hydraulic damper which causes the vent to open slowly but to close very quickly making the opener suitable for use on greenhouse roof vents in exposed areas, the unique damper will prevent the vent from being wrenched open in high winds and subsequently damaged.


Bayliss MK 7 Orchid House Vent Opener
Specially designed for use in greenhouses where a higher temperature is required, this Bayliss MK7 Orchid House Vent Opener is an extremely reliable and is British made.


Super Bayliss MK 7 Vent Opener
This extremely reliable automatic vent opener, the Bayliss MK7 Super has been designed to lift very heavy double-glazed windows weighing up to 35 lbs. (16kg).


Replacement Cylinder For XL Vent Opener
This easy to fit Replacement Cylinder is suitable for the Bayliss XL vent openers manufactured since 2001.


Replacement Power Cylinder for MK 7 Range
This Replacement Cylinder is suitable for the Bayliss MK7, MK7 Triple Spring and Hydraulicheck automatic openers.


Cylinder & Washer to fit Orchid Opener
Specialist power tube designed for use in greenhouses and conservatories that require a higher opening temperature, I.E. Orchid Houses.
This Replacement Cylinder is suitable for fitting to the Bayliss MK7, MK7 Triple Spring and Hydraulicheck automatic openers.


Replacement Cylinder for MK 7 Super Vent Opener
This Replacement Cylinder is suitable for the Bayliss MK7 Super Vent Opener.


Automatic Louvre Opener
This Automatic Louvre Opener, opens and closes your Louvre Window as the temperature changes.
Making sure your greenhouse does not overheat whilst your at work or away on holiday.


Replacement Cylinder for Automatic Louvre Opener
An easy to fit replacment cylinder for the Automatic Louvre Opener manufactured by Thermoforce.


Bayliss XL Vent Opener in Black
This smart, new Black Bayliss XL Vent Opener is perfect for those gardeners who want a reliable automatic window opener yet at the same time want it to be unobtrusive and match to the darker greenhouse colours. Simple to fit, this vent opener simply 'clips-on' to the frame of aluminium greenhouses and then starts working straight away. It's capable of lifting a load of up to 5.5kg (12lbs) and gives a maximum opening of approximately 30cm (12").
Bayliss Automatic Louvre Opener
This Bayliss Automatic Louvre Vent Opener is designed to fit simply, neatly and unobtrusively to a greenhouse louvre vent.
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