| 21. | They had the air ducts and carpets cleaned and installed an electronic furnace filter.
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| 22. | And then some air ducts, that stuff was falling down.
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| 23. | The crew found no spores Tuesday in first-floor air ducts.
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| 24. | The blast ripped down ceiling tiles, insulation and air ducts.
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| 25. | The second change was in making use of on-board equipment, specifically compressed air ducts.
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| 26. | Crews inspected the second floor air ducts and set and set up air monitors.
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| 27. | Q . How can I insulate my hot air ducts?
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| 28. | Escaping through the air ducts, Mel and the Doctor discover the pile of bodies.
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| 29. | Within, the structure was a jungle of machinery, pipes, conduit, air ducts, stairways, catwalks.
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| 30. | Jerry-built air ducts make up for the broken fans.
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