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Engineers inspecting ventilation fans in High Speed 1 tunnel which provide fresh air and can pressurise tunnels in emergencies Stock Photo - Alamy
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Huge Ventilation Fans Just Like an Airliner's Engines: Understanding the Ventilation System Essential for a Safe Tunnel Environment | Business Solutions | Products & Solutions | Feature Story | Panasonic Newsroom Global
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Lasko 20" Wind Tunnel 3-Speed Floor Fan with Remote Control, A20700, Gray, 23.25"L, New - Walmart.com
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