A ANLEOLIFE Automatic Roof Vent Opener Greenhouse Accessories Solar Window Louvre Thread Opener, Up to 30lbs (Dual Spring Opener)

We installed 5 of these on the lift-up (2) and lift out (3) windows of our shed-attached, lean-to greenhouse. We’ve had them about a month now and they are working great! They automatically open the flap windows wider and wider as the temps in the greenhouse rise during the day. And close them as temps drop in the evening. We installed the heavier duty (for 30 lbs and under)—which installed fairly easily although the instructions were a bit vague—and have had no issues at all. We are very happy with this purchase.

If you are getting this to replace one that is broken before you take the old one off pay close attention to how it's installed it's not the easiest task to install unless you play close attention to the assembly of the old one!After multiple attempts to install I finally got it and it works as advertised!

ok, so this is going on a palram mythos greenhouse, which the box says it will fit. Well, sort of. the bottom bracket has a variety of hole sizes, so yes that fit the existing bolts fine. The upper bracket--not so much. I had to file those larger to use the bolts that fit the greenhouse frame. The instructions are a bit vague. It says if your vent opens more than a certain amount to use the upper hole. Well, a mythos vent will open more than 90 degrees, but apparently the company meant for you to check how far it will open AFTER you install the bracket but before attaching the opener bit. I found it impossible to screw the piston into place until I moved the setting to the 2nd hole. It is opening and closing fine, although I wish it would open the vent wider. it is 84 degrees today and the vent is open 9.5".

I built me a garden shed and in the top part of the wall I made a opening and attached this to it so when it gets to warming area it opens it up and that's the hot air out from the top area. My other one lasted a few years.

my coldframe right now is 82 degrees and this is not opening at all. really discouraging.

It worked well for my cold-frame for a couple years, before it broke. The metal used is some pretty low grade pot metal for the connection that broke. I'll probably fabricate something stronger and see if it will last a bit longer. I did order a new one in the meantime (I'll update this if it it comes with a better part).

Better quality and stronger parts than the one supplied on the Costco greenhouse, little bit on the costly side, but check around these things are not that cheap.Works perfectly.Easy to fit, easier than the Costco one, hah., and yes does fit wood too, has fittings to work with metal or wood (at a minimum).Looks fine.

This works perfect for my green house. Opens when it gets hot. The temp is adjustable. Love this. Fix it and forget it.