| 11. | Cartwright encounters several corpses as he makes his way through air ducts.
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| 12. | Raised ceilings with exposed wires, air ducts and cables are in.
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| 13. | He hid the parts behind walls, in air ducts and under the floors.
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| 14. | A boiler ripped from the building, electric wiring, pipes, air ducts.
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| 15. | The devices would sit inside city water lines or in building air ducts.
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| 16. | Investigators believed that an improperly reinstalled bleed air duct led to control failure.
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| 17. | The roof of the pavilion contains a system of air ducts.
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| 18. | Bakharev is then dragged into an air duct and killed.
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| 19. | Make sure the heating and air ducts are properly installed.
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| 20. | Filters can be installed within the heating unit and / or inside hot-air ducts.
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