31.   They had the air ducts and carpets cleaned and installed an electronic furnace filter.

32.   To torment them, they dropped grenades down the air ducts, just missing Lindh, who was crouched in a corner.

33.   To most of us, a large, industrial space with exposed air ducts, cement floors, and huge windows might seem the antithesis of the word home.

34.   To reduce further staining, have your air ducts cleaned.

35.   Wiring, plumbing, vent stacks, air ducts and the chimney typically have holes or gaps that should be sealed.

36.   Within, the structure was a jungle of machinery, pipes, conduit, air ducts, stairways, catwalks.

37.   A white roof bristling with glass cones and spike-shaped air ducts gives it the look of a gleaming tent city.

38.   AMI employees are worried about anthrax in the air ducts and on computer keyboards, like the one used by deceased photo editor Robert Stevens.

39.   Among other things, officials said, fire exits were inadequate and tent obstructed the air ducts of an underground gas station.

40.   At the Nu-Look Hair Salon, a CDC agent wearing blue gloves took swabs of surfaces and samples from the ceiling air duct.