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

I built a custom greenhouse with a wood frame, and needed a way to automatically open a window for ventilation. I bought the $20 one from Harbor Freight, but it didn't appear to ever work, so I returned it. Decided to pay up for this one. So far, it works perfectly and reliably for about a week now. Installation was easy. I made an adjustment this morning so the closure is now flush. I love having a greenhouse that doesn't need constant monitoring. It's a bit expensive, but all the good ones are. So, until Wal-Mart starts selling these, I will have to live with the price. But, it was worth it to me, to have automatic ventilation. I also like that the hardware never extends more than an inch or two into the greenhouse, which will allow me to build a screen frame that will keep rodents out.

Most of the openers that I saw on amazon had the opening cylinder protruding from the back of the opener, which I felt might get in the way. This opener cost twice what others cost, but the cylinder did not protrude from the end. I live in a fairly mild climate which usually drops to the 30's or 40's at night, and rises to the 50's or 60's during the day in winter. Under these conditions, the opener opens during sunny days, and closes at night which is what I wanted it to do. I cant rate its durability yet, since I have had it for about one month.

A great asset to your greenhouse!

I build a cold frame using some 2x's and an old window, but needed something to handle venting it as I work full time. This thing has been fantastic, allowing me to easily and without any effort acclimatize my plants as I transition them outside. Once I get the real tender plants out I'll be removing the window and the venter to grow lettuce until things get chilly enough again to need it. Highly recommend, great quality!

These are my second order of bayliss vents They can be left up year round and just unscrew the threaded screw to not open when unpredictable Texas cold front arrives

the friends that have been to my GH rave about seeing these openers, they are constantly moving in the changing weather,I brag about how well they work to everyone

these work great and very easy to install, also very quick delivery

We were so excited to update our greenhouse with another auto vent, but we have had 50% yield. One of our two vents leaked out in less than a year, leaving us hunting for another in a matter of days or having our greenhouse exceed 100 degrees. Additional tips or improvements to maintain longevity would be appreciated.

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

Easy to fit and works well, great ventilation and value for money

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!