Auto Vent Opener Automatic Greenhouse Window Opener Cylinder Roof Vent Opener Autovent Kit Solar Heat Sensitive Agriculture Gardening Tools Automatic Greenhouses Supplies (Single Spring Lifts 15 Lbs)

For me, the enclosed directions on the instruction sheet were a bit confusing and I wish I had a third hand while working over my head to attach these to the window frames. Once installed though, they work like magic! I’m pleased with the value for the money and how efficiently these work.

This is the second one I purchased - the first was nicer. https://www.amazon.com/dp/B0083IZG0AJust some slight design decisions make that one open a little easier, and possible to take down in the winter (this one needs to be unscrewed to "turn off".I also hadn't realized there is a minimum window size - My second project has a smaller window in the roof, and this is much too large to open my 8 inch window, so I'm back to try to find one that opens a smaller window.

I installed these 3 days ago in an 8’ x 10’ hobby greenhouse. Our temperatures are in the 40s at night and 70-80 daytime. So far they have closed the roof windows by about 7 pm and they open as the greenhouse heats up in the morning. The installation instructions are hard to follow and I mostly ignored them. The first step was to attach 2 brackets. I couldn’t figure out what they were for, so I didn’t use them. They don’t seem to have been necessary for my application. The pin that holds the piston in place didn’t fit the holes it was supposed to go into. I ground it down rather than drill out the holes, but I suppose one could do either. The pin got in the way of the widow closing all the way, so I had to cut the top of it off. If you’re handy, you can probably install these. I gave the product a 5 rating despite the poorly written and illustrated instructions.

The canister leaked. I stull tried to get it to work. It snapped back and hit me in the chest... snapped on my thumb...If I had a few extra arms and it didn't leal maybe I could rank higher. But the instructions were awful and the install a nightmare.

we have 4 andthey work great.wo we are adding on to the geen house and will add 1more top window so we went with what we knew would work

This is a perfect fit & works in all weather!

These are easy to install (despite the instructions making it seem more complicated than it should be). I have a small, janky greenhouse/conservatory and yet the hinge bolt holes were nearly perfect for my installation. Once installed they have been a game changer for temperature regulation and I only wish I had done this sooner.