1.   Clean the ventilation ducts to remove dust and insect debris.

2.   Ventilation ducts are cleaned to remove dust and debris, birds and insects.

3.   The draught coming in through the ventilation ducts made it tremble continuously.

4.   Another time he slathered himself with hair tonic and tried to squeeze through ventilation ducts in an escape attempt.

5.   A ventilation duct is also directed into the dining room, piping in garlic and oil, new brick and young wood.

6.   Complete with electric lights, ventilation ducts and wooden walls, the tunnel was believed to have been used for drug smuggling for several years.

7.   Emery, one of her office colleagues, had been trying to use his blazer to seal a ventilation duct that was belching smoke.

8.   The Aga uses regular gas lines but does require a ventilation duct that reaches the outside.

9.   The telephone system, for example, was not working, plywood sheets lined many unfinished hallway floors, and ventilation ducts were exposed.

10.   They swabbed dust in cracks, under the desks and from ventilation ducts and filters.