I brought this product to open a double window in my greenhouse, the window frame is made of cedar wood and has a lot of wait to it. This is why I brought this more expensive item over the cheaper products on eBay. I am very happy with his item and it's performance.
Thermal window opener for heavyish frame. Sturdy. Installation easy with Megavent video.
This thermal opener works with a panel 800x800mm (polycarbonate sheet and PVC frame, unable to give an accurate weight but approx 10-15kg, pushes window to about 420mm (approx). In my view, well made, sorry I can't be more specific with the technical stuff. I suggest looking at the Megavent video on Youtube as the installation needs you to check keypoints.
The item was impressive, expensive, and hard to assemble. Additionally, I have no way of knowing if it works or how to make adjustments. I will not make this purchase again.