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This is how the subway is „breathing” | Official website of the reconstruction project <br>of metro line M3
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The Community of Madrid implements a new smart management system for the ventilation of Metro facilities | Metro de Madrid
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File:Ventilation shaft of Chkalovskaya metro station (Венткиоск станции Чкаловская) (6633501979).jpg - Wikimedia Commons
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Intelligently-controlled ventilation for Barcelona metro | Metro Report International | Railway Gazette International
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