Bayliss XL Autovent - Automatic Greenhouse Window Opener - Temperature Sensitive Solar Vent Opener

Bought to replace a broken window system in an old metal greenhouse. It's been commented as 'easy to install' whilst this is true, it is not difficult, it IS fiddly. The instructions are very clear and very good, it can be fitted on a lip present in metal framed greenhouses or screwed into a wooden greenhouse frame. We have metal so I can only really comment on this. So, it uses a metal lip on the hinged window and a metal lip on the frame below this window. It basically makes a 'vice' between the metal lip and a metal plate you 'screw' onto the contraption. You are tasked with creating this vice on one side of the item and tightening it into place and then flexing it to get the vice on the other side. It basically needs you to put pressure on the spring and to hold and tighten the vice at the same time. It would absolutely be easier with four hands, so if you think you might struggle, borrow a friend for a few minutes. But the time needed to fit it, is very much so, about 4 to 5 minutes (not including half an hour in the fridge so get the gas chamber easy to fit- you don't want it expanding in the heat as you work on it - covered in the instructions). Easy to install, but a bit fiddly if you're by yourself. It arrived quickly, installed quickly and we noted the next day in the variable warmth of early May, it was working, both to open and close carefully. Very happy with the product, opens a lot wider than the one we had before (it was about 10 years old) and the tomatoes seem to like it. Be careful when you tighten the hinge to close it using the end screwing system at the final stage of the process, the metal was a bit sharp and again, quite fiddly to get fingers in, use a tool or wear gloves or it may scratch your knuckles/fingers as you turn it.

Looked at a few options before settling on this one. Wanted an opener for my small palram lean to green house, the important attribute was the piton being incorporated into the scissor sections and not protruding as with other brands as this would foul on the limited room and clearance. I had it fitted with the easy clamping system in 10 minutes, it is pretty easy but also a bit fiddly. If you’re a handy diyer or played with mecano as a kid you’ll find it simple enough. I Chilled the piston as per instructions, fitted it and adjusted things and then watched in amazement as it slowly opened the window as and when the sun warmed things up a bit. I checked at end of day and it’s closed down again. Time will tell but so far pleased with it, might add some pictures in time. Hoping the plants will get optimal warming but not get cooked compared to me manually guessing a good setting for the window and door as I remember to do it. Chose this one for the neat and clever design, it’s a known make so should be good for spares in the future, plus it’s made in Britain, also a #1 best seller.

Have used these exact same openers in the past with older greenhouses and had absolutely no problems fitting them. With my new greenhouse however came close to cracking the glass as bolts protrude slightly too far, luckily realised in time before any damage done. As greenhouse has the appropriate holes for fixing an opener decided to fit it properly using bolts rather than the supplied clamp plates. Opener itself operates perfectly. In summary I'd recommend these so long as you're careful when fitting.

I have had these fitted on my greenhouse windows since 2023, and they have never failed to open, no problems,

Watching the vent open and close on the greenhouse is like magic. It's such a simple idea, but it works brilliantly. I like that the piston on this one doesn't hang down as most of the others do. It's inline with the bracket, so you aren't going to hit your head on it and break it or hurt yourself. The device feels robust. I don't know what the life of a cylinder is, but replacements are relatively inexpensive and could be fitted without detaching the device. Installation was a doddle. I did it on our aluminium greenhouse while the children were getting dressed for school (having put the piston in the fridge overnight). If you're installing it into an aluminium greenhouse, put the instructions down and watch the video on the listing or search on YouTube. There's a short video that is really very clear. For a wooden greenhouse, it's the same but you screw it into place. I'm so impressed that I bought another for the other vent. :-)

Excellent. Il faut BIEN suivre les instructions. L'ouverture est facile à mettre en place et fonctionne à merveille.

Opens vent fully at warm temperatures in the sun

Sehr stabil und zuverlässig. Es ist in einem kleinen Gewächshaus ein großer Vorteil, dass der Zylinder nicht hervorsteht, wie bei günstigeren Hebern. Hebt problemlos mein schweres Dachfenster aus druckimprägniertem Holz im Selbstbaugewächshaus (siehe Foto). Ich werde noch eines bestellen, um die Lüftungsfläche zu vergrößern. Update nach 4 Jahren: Funktioniert noch immer perfekt. Der Zylinder wird im Winter bei mir nicht ausgebaut.

Great product, easy installation, recommended!

Wir haben ein Palram BELLA 8x16 Gewächshaus und haben die Standardöffner durch die Bayliss XL ersetzt. Die Beschreibung ist zwar in englisch aber die Zeichnung und die Funktion sind selbst erklärend, die Öffner müssen vor Zusammenbau mind. 30 Minuten in den Kühlschrank damit sich das Wachs zusammenzieht ( wir hatten Sie 1,5 h drin). Zu zweit lassen sie sich gut einbauen, wobei wir die Fenster abgenommen haben und Den Bayliss erst am Fenster befestigt haben und erst dann am Rahmen die Befestigung vorgenommen haben. Da beim Palram der die Befestigung mit Hammerkopfschrauben erfolgt und man dann die Mutter nicht mehr aufschrauben kann ( zu wenig Platz) haben wir ein extra Loch gebohrt Undine mit einer statt mit 2 Schrauben gearbeitet. Aufgrund der stabilen Ausführung des Bayliss ist das kein Problem, die Fenster öffnen und schließen perfekt und bündig. Wir wollten keine Öffner wo der Zylinder ins Gewächshaus ragt wenn sie geschlossen sind und haben uns daher für die Bayliss entschieden. Klare Kaufempfehlung, Qualität und Preis-Leistungsverhältnis stimmen zu 100%.