Bayliss XL Greenhouse Aut... has been added to your Basket

Other Sellers on Amazon
Add to Basket
£17.49
+ FREE UK delivery
Sold by: Maunders
Add to Basket
£17.50
+ FREE UK delivery
Sold by: Home and Hearths
Have one to sell? Sell on Amazon

Bayliss XL Greenhouse Auto Vent

4.4 out of 5 stars 162 customer reviews
| 6 answered questions

Price: £17.81 & FREE Delivery in the UK on orders over £20. Details
In stock.
Sold by Plumbing Supermarket and Fulfilled by Amazon. Gift-wrap available.
9 new from £17.49
  • Solar powered greenhouse vent opener
  • Clamps to greenhouse bars - no drilling needed
  • Quality construction
  • Made in the UK
  • 2 year manufacturers guarantee

Enjoy the Great Outdoors
All you need to enjoy the summer. Browse our selection of garden furniture, barbecues, pools and more. See more
£17.81 & FREE Delivery in the UK on orders over £20. Details In stock. Sold by Plumbing Supermarket and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

  • Bayliss XL Greenhouse Auto Vent
  • +
  • Max Min thermometer for conservatories, greenhouses & grow rooms (Green)
Total price: £22.81
Buy the selected items together

Special Offers and Product Promotions


Product details

  • Boxed-product Weight: 499 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
  • Manufacturer reference: XL
  • ASIN: B0039NUEV0
  • Date first available at Amazon.co.uk: 1 Jan. 2010
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (162 customer reviews)
  • Amazon Bestsellers Rank: 7,323 in Garden & Outdoors (See Top 100 in Garden & Outdoors)

Product Description

BAYLISS XL Autovent - full retail package Brand new 2012 stock available for immediate despatch. We usually ship all orders received by 3.00pm the same day. Offered with a manufacturer backed full 2 year guarantee. Opens greenhouse roof vents as the temperature rises, automaticaly closes as temperature drops. Automatic Greenhouse Window Opener, Simple, Strong & Easy to Fit. Made Entirely in the UK • Easy to fit - Screws into wood and clamps onto aluminium greenhouses without the need for drilling. (Full fitting instructions supplied) • Easy to set - one simple adjustment • Solar powered - Non electric • Strong build • Loses no headroom • Anodised aluminium construction - All parts corrosion resistant • Spring controlled - Resists wind damage when opening and closing • Quality assurance - All parts guaranteed for 2 years Suitable for opening hinged vents up to around 2ft square (600mm) of normal construction.


What do customers buy after viewing this item?


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
Relatively easy and intuitive to install I have had this in my greenhouse throughout the summer and it has worked consistently all the way through. Relatively new to greenhouse gardening I soon realised that good ventilation was more important than tropical jungle effect for tomatoes and cucumbers and the like. This auto vent pops up at about 20C and then full extends at about 30C helping keep temperatures around the upper 20s. You can control these ranges a little by a screw which damps the spring mechanism. Cheapest I could find and it does the job
Comment 3 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
Bought to replace a broken one in my 22 year old greenhouse. This is the third one that has been fitted including the one that came with the greenhouse when it was new. Quite fiddly to fit and the instructions are not very good. My husband tried to fit it whilst the sun was shining on the greenhouse but because of the temperature inside, the arm kept expanding. He waited until the evening when the temperature had dropped.
Comment One person found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
This is the second Auto vent I have purchased. The first one I returned because the adjustment nut was just too stiff to operate. Amazon were great and refunded the monies immediately. On arrival I immediately checked the adjustment on the Auto vent, better, but still stiff. The adjustment mechanism comprise a brass insert embedded in a plastic swiveling block. The block allows the adjusting nut to rotate and the auto vent's arms to pivot. The brass insert is threaded onto the steel piton rod. It is great to see the brass component in the system, should give a very positive action, be self lubricating and be durable and long lasting. I found the tolerance between the thread on the piston rod and that of the brass insert a little tight. A problem exacerbated when the system comes under compression from the weight of the window and the retaining spring. To overcome this the adjusting nut has to overcome considerable amount of friction. A larger diameter adjuster would be of benefit as this would increase it's mechanical advantage and make it easier to operate.

In use, I find in my installation that the thread on the piston rod could be longer. I find that I am right of the end of the thread with the window barley closed thus limiting the temperature range at which it will open.

Installation is fiddly but following the instructions precisely minimizes the hassle, particularly the cooling of the power tube.
Comment 3 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
Robust, works well. Took about half an hour to fit to Aluminium greenhouse. Quite easy to fit provided you loosely attach the two backing plates first. Also very easy to adjust opening temperature as long as you support the weight of the window while doing this.
The design means that it is less likely to leak wax than some other models
Comment 2 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
By Gray on 25 April 2015
Verified Purchase
Brilliant! Easy to fit to a Halls aluminium greenhouse and works really well. Glad I read the instructions about putting it in the fridge first though as there's no way I could have positioned the bar otherwise.
Comment One person found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
This is the third Bayliss opener I've bought, the previous ones being 5 or so years ago, so I forgotten just how difficult they were to fit, I seem to recall it taking me an hour each at the time. This one was a Xmas present for my Mum's greenhouse. Fitted it a few days ago and it took me a frustrating hour and an half to do! The problem is the slots for the bolts at the window end are obstructed by part of the mechanism, never mind that it's also trying to fit the nut between frame and glass. Even the enclosed clamps wouldn't locate correctly so I had to use the nuts and bolts. I guess it should have slightly easier if I took the glass out, but having only just re-glazed the greenhouse the week before and the glass was now well bedded-in and stuck to the mastic, that was not an option.
As an aside I'd managed to break one of my first Bayliss openers on the same day (As it had been difficult to fit in the first place those 5 years ago I was unable to tighten it properly so the clamp came loose and it dropped down when sterilizing the greenhouse. I then managed to catch and bend it - they aren't very robust anyway.) In this instance after the frustration with fitting Mum's Bayliss, I replaced mine with an Orbesen opener. It took me 10mins to fit that type - and without even considering the grass removal. Much easier. I'll leave the reader to draw conclusions.
But otherwise they do work fine - once fitted.
Comment 6 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
With the UK so interchangeable I needed to a product to help cool the greenhouse when I'm not about. Found this greatlittle item in Amazon. Arrived quickly from the seller, really easy to fit and product is very well made. Does what it says gets hot and automatically opens your window plus you can adjust the setting easily to get the performance perfect for your requirements with just a turn of a dial.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
On unpacking was obviously far better designed than my old vent control. However, when fixed the vent opened at just before 65F and I could not adjust it any more to open at higher temperature, (I wanted 70F).
On contacting Bayliss was told that they also had an actuator that was meant for Orchid houses and this opened around 70F.
I decided to purchase one and this worked satisfactorily.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse

Most Recent Customer Reviews