Second unit for an additional cold frame, since the first one performed as expected, might as well stick to something I know works, Thank you.

works perfect for coldframes. Good quality material,easy to setup.

This lifter works great for us. We use it to open the cover and vent our cold frame. Extremely well built. Looking forward to years of seasonal use! Also appreciate the great service of this business. They carry quality products and provide timely service.

I love having this auto-vent on my cold frame so my cold-weather veggies don't cook on sunny winter days. :) Thanks!

When we purchased our greenhouse, we received two Univents. They work so well, we purchased two more so all the top windows will open. It's amazing how they work.