ventilation

Everyday

1. The movement of fresh air into a room or building and stale air out. tree →
2. The system, such as vents or fans, that does this. tree →

In the lessons

In science and health: good ventilation helps stop germs spreading and removes fumes. In safety: use paint or glue with good ventilation; never block air vents near a heater. Phrases: «good ventilation», «poor ventilation», «ventilation system».

Examples

• Open the windows for better ventilation. tree →
• The classroom has poor ventilation and gets stuffy. tree →
• Paint the fence outside where there is plenty of ventilation. tree →
• The kitchen fan improves ventilation when we cook. tree →
• Ventilation helps reduce the spread of colds. tree →
• The ventilation system in the tunnel blows in fresh air. tree →

Note

Uncountable: no «a ventilation». Verb: ventilate. Vent = an opening for air. Safety: gas heaters and fires need ventilation because they can make dangerous carbon monoxide.