Ellovent® Special Heavy Duty Automatic Greenhouse Window Vent Opener Autovent

This is a MUST HAVE for any greenhouse window vent! It opens and closes by itself so you don't lose all your plants by forgetting, just one time! We take it in after we're done with the greenhouse and store inside. so make sure the fluid inside stays operable. I'm not sure if you have to, we just do… Read more

I haven't had a chance to test it yet, but I assume it works.

I've had one of these (same brand, from Denmark) on a no-name greenhouse in our yard for years and had zero issues. So when we built a Grandio Summit greenhouse, I tested one unit bought here on Amazon and found it does fit using the Grandio hardware system (so I purchased 5 more). Use the same litt… Read more

I'm really happy with the Univent window openers. They are easy to install if you refer to a picture of one installed. They open and close at the temperatures noted in the instructions.I've also purchased 2 of the "alternate brands" of these and found that their open/close temps were off and they do… Read more