All in good working order when our greenhouse was taken down last week - they open the vents in response to the heat inside the greenhouse, as the wax inside the cylinders expands when it warms up. They’re still attached to the frame, so you’ll need to bring tools to remove them, or take the panels too and remove them at home. Have included a photo of the fixing so you can work out which tools you’d need - I think it’d be a socket set.
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