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My greenhouse has manual vents in the roof, and I would like to fit automatic ones. My friends' greenhouse has the sort that don't need electricity to run, but I can't figure out how they work.Can anyone advise me on how to convert manual to automatic vents please?How do they work?Is there a good sort to get, i.e. are some makes/types better than others?Is it difficult to fit them, i.e. should I get an expert to do it?Thank you, hope someone can help ::)