ionizerchamber (IMAGE) Colorado State University Caption The environmental test chamber where researchers conducted air purifier experiments. (a) is the exterior with instruments set up outside, and (b) is inside the chamber with mock-up furnishings and materials. Credit Illinois Tech Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.