Solar Heat Sensitive Automatic Greenhouse Window Opener Hothouse Vent Openers Auto Vent Kit Greenhouse Accessories-(Two Springs,Lifts 15.4 Lbs)

In spite of less-than-complete directions, this vent opener installed quickly and easily, with the only modification required being to widen one end of the slots to accommodate the standard Palram bolts. I did that easily with a drill and properly sized drill bit, and installed the device. The only piece lacking was the cotter pin to connect the cylinder to the vent tube. However a large paper clip is doing the job temporarily.I'd also like to add that I previously upgraded the rather flimsy Palram "hinge" with a piano hinge also from Amazon, and the window is solid even in our seasonal desert wind gusts. You will also notice cables over the entire structure, connected into strong anchors near the base.I am hopeful that this device will have a long life!

After figuring out installation process, very pleased with this product. Vent windows on my greenhouse opan and close automatically with this technology. The vents open based on the sun heating, not all at the same time. Kind of fun to watch the opening and closing process.

Mine worked great for my Grandio greenhouse. However the top bracket that attaches to the vent (the part that lifts up) wasn't wide enough for the existing holes. So I could only get one screw in. This opener is a lot cheaper, compared to the 70$ ones on Grandio's website. The only reason why I am taking one star off is because the instructions were HORRIBLE! I was looking at pictures and watching YouTube videos.***NOTES*** If you buy this, make sure it's well lubricaded. If it's not, it won't work or last for long. I don't think they mentioned that in the instructions. The more more you push/screw the rod in, it'll lift at the coolest temperature. I have mine screwed in almost all the way and it begins to lift at 65°/70° F. Make sure you take the rod inside during winter time (can damage if it freezes).

Out of the 4 I bought, 3 broke within the first month from regular use and I expect the last one to break soon.The metal is soft (probably aluminum) which bends easily and the hinge easily breaks.The first one broke as I installed it, with the hinge breaking as I attempted to connect the cylinder. It seemed to just come apart in my hand with little pressure ever applied to it.The other 2 broke from the metal shaft bending, slowing getting worse and worse until they were frozen in place. The last one already is bending as well and will soon be frozen.

I followed the instructions and refrigerated the piston while figuring out how to mount the vent arm to the frame of the greenhouse. I ended up using hardware that came with my greenhouse, the actual process of installation will depend on your specific greenhouse. If you are handy, you will figure it out pretty easily. There are several holes in different sizes for mounting the arm to the sill. My existing hardware fit into the larger holes. I didn't use any of the hardware that came with the opener. I had to slightly widen the holes on the window end of the arm. If you want something that works right out of the box, you'll need to buy an opener made by the same manufacturer as your greenhouse.It was a warm spring day when I installed the opener and within a few minutes it fully opened the vent. Hopefully it lasts several years.

It works great. The only thing is the directions were not helpful. If you look at it you cam figure it out.

We tried using this on our Palram greenhouse but would have had to modify the brackets to make it work. We followed the instructions for the cylinder, but it would not extend when warm so we returned it.

Used for a week now (February in TN) opens greenhouse window on sunny days and closes every night or cloudy day.

Great quality - works every time.

I've given 5 stars even though it came with wood screws we do a few alterations as others describes we have 6 openers on 4 greehouses works well in our Australian hot climate. Very happy so far it's only the first summer our winters are -6 oC Summers are around 38 - 42 oC.

This item arrived on time and is perfect for my Palram 6 x10 greenhouse Had to make the mounting holes a little bigger but other than that so far so good. Instructions were quite easy to follow.Thanks

Pour ma serre.

Works as expected. Good adjustment capability. Will buy again.