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Some answers in the comments: In general yes. You will see a lot in South America. There is not much need for better insulation, and because of gas (hot water, and kitchen) where is need of ventilation. But so often (but on private properties) there is a sign about not putting something to block ventilation. – Giacomo Catenazzi ↵ Dec 17 '19 at 11:24 ...

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