DESC: your environment, and since they're 30% quieter than other air purifiers, you'll be able to relax while they do their job. Six times per hour, the large room air purifier cleans a room 14' x 15' and the conference room cleans a room 20' x 30'. The slim design fits flush against the wall of any office or home. Advanced HEPA technology guarantees the quick removal of 99.97% of airborne particles