Window ventilation

[Seadog]

Hello again. I've got another greenhouse question.

I'm planning to install automatic window vents in my 12 x 8 greenhouse. There is a 3-pane louvre vent opposite the door which I hope to change to a 5-pane. What's the ideal number of window and/or other vents for this size greenhouse?

Thanks.
Seadog

[JWK]

As many as possible! I've got an auto vent in the roof of my 8X8 plus a large louvre vent - in the summer this is not enough, it needs the door leaving open and shading applied to keep it cool. Try and position your two vents at opposite ends if you can, to acheive a better airflow.

[Hex]

..also try to get a get a decent height difference between the top and bottom vents.