1. If it is in the ventilation system, it could have spread to other areas.

2. One by one, people started taking turns breathing from a ventilation hole in a wall.

3. But investigators discovered that the Energy Department never required the ventilation system to meet nuclear safety standards.

4. He said the snake made its way through the ventilation system, the pipe collapsed and the snake fell.

5. The tunnel was equipped with lighting, ventilation and a motorcycle.

6. The ventilation on the trains themselves sucked smoke into the trains.

7. Sensors in your attic can lead to notifications that you need better ventilation, or that you should consider adding more insulation.

8. A compact interior ventilation system keeps installation simple.