The openers came quickly and all is as advertised. Waiting for our new greenhouse to get here and get them installed.

Will definitely purchase from ACF again!

Recently installed the automatic vent openers and there work perfect. Simple to install. I placed one on each vent corner (2 per vent) as we get a lot of wind gusts. Bad storm came through last week and the vents were fine with no issues. I would recommend and purchase again.

 

When I built the greenhouse it came with two of these vent openers, during the winter months I did not notice any help, as soon as the sun came out they showed their worth. So I bought two more, no more worries about overheating! They work great, easy to install, and do not require my memory to operate, what more could an old fat guy ask for!!!

We've been using these automatic vent openers for about a month now; they are great! We don't have to go out and check the temperature and manually open/close the vents.