So we're talking about very tiny particles here indeed ... This is a measure of how quickly the purifier can clean the air in a given room size. Look for a CADR that's at least two-thirds of ...

The giant, 40-ft. space telescope resting in the airtight, climate-controlled clean-room at NASA’s Goddard Space Flight Center in Greenbelt, Md., wants nothing to do with the microscopic dust ...