Vaisala CO2 info

I have looked & looked for a company that deals with CO2 sensing combined with ventilation.  I found lots of good information on several types of sensing units from a company called Vaisala.  I have sent an email requesting more information about the company & where the sensor are manufactured.  I could only locate sales offices from the web page, but was able to get spec sheets for the sensors.  This company advertizes that they have applications appropriate for home, school, and business.  I will see what else I can determine about the company that is not on the web page.