Don't think I've ever seen one here in the US. Are they common in the UK?

These are the small vents that are at the top of modern windows. More than keeping CO₂ levels down, they also stop moisture building up that reduces mould appearing…
Sleeping with the windows open or closed: which is better for health?
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Peter Knapp
Alex Bransky
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Dec 15, 2023
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Don't think I've ever seen one here in the US. Are they common in the UK?
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Written by Alex Bransky58 Followers
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poet, proser, and stuff. empathy lover, hate hater.
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