41. Air ducts and other mechanical services are located in the flat channels between the vaults.42. There may be times when you will want to add or modify an air duct . 43. Also, have your home's air ducts cleaned regularly. 44. A new fresh air ventilating system with air ducts leading from the grille replaced cowl ventilators. 45. Above me, a none-too-quiet rustling betrayed an enemy agent settling into place in the air duct . 46. About 400 people at the plant design and manufacture floor panels, air ducts and cockpit panels. 47. "I didn't get to talk to the Pope " about BTUs and air ducts , said Rees. 48. The cooling air is transported in a closed air duct , which keeps the engine room clean. 49. Sealing your air ducts with mastic is inexpensive and not difficult, and can bring great benefits. 50. I object to using the same air ducts ,
