41.   At the Nu-Look Hair Salon, an agent with the federal Centers for Disease Control and Prevention swabbed surfaces and took samples from the ceiling air duct.

42.   Construction crews working on the main Justice Department building ruptured an air duct in an area contaminated with asbestos Wednesday, forcing the evacuation of some workers.

43.   Coach Jim Fassel said the alarms were caused by a short in an air duct.

44.   He hid the parts behind walls, in air ducts and under the floors.

45.   Krikalev, the lone Russian cosmonaut, also cleared a blocked air duct in Zarya, the Russian-built control module.

46.   Officials had said that fire exits were inadequate and that the tent obstructed the air ducts of an underground gas station.

47.   Officials had said that, among other things, fire exits were inadequate and that the tent obstructed the air ducts of an underground gas station.

48.   She also took samples from the ceiling air duct.

49.   Sergei Krikalev, the lone Russian cosmonaut, also cleared a blocked air duct in Zarya, the Russian-built control module.

50.   The devices would sit inside city water lines or in building air ducts.