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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.

Madam's Woman cave also known as he Orchid greenhouse needs these as the outside temperature range from 40 degrees F to 100 degrees F on the same day. They work perfectly opening and closing the vents as needed.

I placed this unit in my greenhouse on a side window to create better cross ventilation. I already have two of the same vent openers that operate the ridge vents on the greenhouse and they have been working flawlessly for the last years. I will admit to trying to save a buck and previously installing a "lesser brand" of opener on the side window. It did not make it a year before failing.

I went back to the tried and true and am happy I did so.

I very much recommend this vent opener.