Matched context for evacuation and ventilation

The page lists matched contexts for evacuation and ventilation.

Share - evacuation	Share - ventilation	Phrase
5.53%	8.27%	{evacuation or ventilation} valve
3.41%	7.73%	{evacuation or ventilation} system
2.20%	9.40%	{evacuation or ventilation} line
2.67%	5.11%	{evacuation or ventilation} passage
3.15%	4.05%	{evacuation or ventilation} device
7.01%	1.32%	chamber {evacuation or ventilation}
4.98%	1.23%	air {evacuation or ventilation}