I'm considering getting and Automatic Vent opener much like the Ventomax version shown HERE.
Does anyone have any experience with these?
I'm considering one for my Nep glasshouse as I am getting a few hot spikes on sunny days and it seems like a very simple and reliable way to open the roof vent once the higher temps are reached.
If you look on the temperature pages of the link you'll see they have a range of cylinders that will be activated by varying temperatures. *I'm think the F10D is best suited.
I was in the same situation and I have find out that Bayliss autovents (that are bit expensuve) are better ones.