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Well, they don’t seem to be working, but we saw after they were installed that you are supposed to put them in the refrigerator prior to installation. Who would have thunk it, and now nobody wants to climb back up there to take them out on the chance that that might be the problem...

I am using automated openers on wood-framed 10 ft x 2 ft side vents on a high tunnel greenhouse with the hinges on the bottom (top opening). The springs on the Univents are not strong enough to consistently close these vents, so I tried the Bayliss and they seem to be working great; much stronger springs. They open at a lower temperature than the Univents, probably about 10 degrees F lower.

The item was easy to install with the directions. Waited for a warm day at saw that it worked great. Was a little concern because of the weight of the vent because it is glass. But it had no problem what so ever to work. Just make sure to follow the instructions before use.

We are using the Bayliss MK7 to open a top hinged wood-framed window in the roof gable of our greenhouse. Initially I was concerned if it would be too heavy for the opener, but have had no issues. Installation was easy and it works great!

I have the orchid wax model. With the setting knob all the way in, it doesn't begin to open until the internal temp in the greenhouse reaches 85 degrees. Other than that it performs as advertised.