81.   The remaining skunks sprayed into the ventilation system.

82.   The soot-filled filters in the air ventilation systems were changed, he said.

83.   The restaurant had to be equipped with a special ventilation system that prevents the air from recirculating in the restaurant.

84.   The ventilation system can help spread particles, too.

85.   The ventilation system grumbles insistently, and periodically, a dog whimpers in the back room.

86.   The ventilation system is not sufficient to accommodate those functions and the kitchen does not have an exhaust system.

87.   The ventilation system filters out nuclear, chemical and biological agents.

88.   The ventilation systems that were supposed to draw out the smoke and confine the crisis to a small section of the tunnel were overwhelmed.

89.   The ventilation systems will be built into the floor, making it possible to avoid a dropped ceiling.

90.   The well-lit factories had first aid stations, locker rooms and a ventilation system.