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A "clip-on" model lifting a load of up to 5.5kg (12lbs) giving a maximum opening of approximately 12". The unit measures 11" in length and is supplied in satin anodised finish only.

Greenhouse autovents are an effective way to ensure that the temperature in your greenhouse is maintained at an appropriate level - whatever the weather.

Take away the guess work and manual greenhouse ventilation - with automatic vent openers your greenhouse will be accurately vented 24 hours a day.

Bayliss greenhouse autovents are well known for their excellent design, quality and reliability. 

Guaranteed for 2 years.

Q. Will this opener fit my greenhouse windows. No, what i really mean is are greenhouse windows a standard size?

A. Most greenhouse roof-vents are around 2' x 2'. The Bayliss XL Vent is recommended for any building that in in an exposed area.


Q. Hi im about to purchase g/house. what is the best base/foundation. ie flags or concrete

A. Paving slabs are generally a better option than concrete as the joints between the slabs allow excess water to drain away.


Q. Is the Robinsons auto roof vent opener suitable for a wooden frame greenhouse?

A. Yes, a Bayliss XL opener can be fitted to a wood framed greenhouse.


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13 reviews of Bayliss Auto roof vent opener XL
Average rating: (4.9)

08/09/2024
by Alastair Raynes

Works brilliantly. Just about everyone who has seen it have loved the technology. Just wish there was a version where you could dial and down the temp it opens the vent by a few degrees (e.g. from 20 to 25 degrees C).


16/07/2024
by Tracy Boyles

this is an excellent product it has made such a difference to my greenhouse


03/09/2023
by Donald Stewart

Worked perfectly. Took a little working out how best to fit them but once sorted proved very easy to fit and are working as supposed. Many thanks. Donald Stewart


24/06/2023
by Simon James

I'm so glad I bought this item - I wish I had done it years ago ;-)The Bayliss product appears a bit flimsy, although they do a more robust high-wind version, but it seems to be doing the job well and was easy to fit once I had read the instructions.It vents the glasshouse well before I manage to get out there!


06/06/2023
by Mrs Schooling Schooling

Exactly what I wanted to replace some that had seized up. Work perfectly.

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