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Bayliss Greenhouse Autovents

An auto-vent opens and closes a hinged vent automatically using energy from the warmth of the sun or the surrounding air. The hotter it gets, the wider it opens the vent. See more technical information.

Bayliss autovents - the most trusted and best quality automatic vent openers

Adequate ventilation is one of the most important aspects of greenhouse growing and our autovents take the guesswork out of this all important operation, ensuring accurate, continuous venting 24 hours a day.
Bayliss autovents are suitable for both wooden and aluminium windows and frames and the wide range available means that even if you require an autovent for a windy location or to lift heavy double glazed conservatory or greenhouse vents, we have an autovent to suit your needs.


Click on the links below to see further information for that product.

Louvre Automatic Vent OpenerNew - Louvre Vent Opener
We have often been asked for an autovent that can be used with louvred windows. We are pleased to announce that our technical team have come up with a solution. We can now supply a louvre vent opener which is designed for use with greenhouse louvre windows, it fits neatly and unobtrusively.
Mk 7 Standard AutoventMk 7 Standard Autovent
Designed for aluminium or timber framed vents measuring up to 60cm square. MK7 Autovent Best Buy
Mk 7 Triple Spring AutoventMk 7 Triple Spring Autovent
Greenhouse autovent suitable for opening top hung aluminium or timber framed vents.
Mk 7 Hydraulicheck UnitMk 7 Hydraulicheck Unit
Addition of Hydraulicheck creates an autovent suitable for use in severe weather.
XL AutoventXL Autovent
"Clip-on" model lifting a load of up to 5.5kg and a maximum opening of approx. 12".
Mk 7 Super AutoventMk 7 Super Autovent
Similar to the Mk 7 model but larger, suitable for operating heavy double glazed vents.
Replacement Power Tubes, Conversion Kits, Screw Packs and Accessories

Replacement equipment and autovent accessories to maintain a healthy and long lasting efficient autovent

Choose Bayliss Autovents - Best Buy!

Mk7 Standard
Selected 'Best Buy' in
Amateur Gardening Magazine
4th May 2013

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See the MK7 Autovent

Bayliss Greenhouse Autovents have been produced since 1964 by our family business in Derbyshire in the UK. Our autovents have been designed by our precision engineers and are completely sourced within the UK.

As specialist precision engineers, we are proud of the reputation we have for design, quality, reliability and service. Bayliss are the original designers of the mechanism which keeps the vent entirely within the window frame. We offer a range of autovents that covers almost any automatic ventilation requirement you may have.

Beware of imitators! Bayliss have led the way in autovent design and quality over many years and our automatic vent openers are widely recognised as the most reliable autovents available today.

Corrosion resistant construction Balanced lifting action
Illustrated fitting instructions Alternative finishes and colours
Customisable designs Manufacturer's Guarantee


Frequently Asked Questions

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Bayliss Autovents are
manufactured in the UK
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