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Arthur van Beveren on X: "Up until 1942 only one air vent was deemed fit for an air intake. With a new series of bunkers specifically designed for the Atlantikwall, the 600
Photo 1265-08: Ventilation shaft of old powder bunker in north...Mon Repos) Park. Vyborg, Russia
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Underground shelter, Fall out shelters, NBC air filtration - Commercial and Residential Doors
Arthur van Beveren on X: "The bunker's ventilation system was standardised as well. Fresh air was pumped inside the bunker by a ventilator to create overpressure, keeping out toxic gasses, which the