Sharp Plasmacluster Ion Air Purifier with True HEPA + Humidifier for Medium Rooms(P)(B)AIR PURIFICATION FROM A BRAND YOU TRUST( B) ( P) (P)You know the importance of indoor air quality. You should have an air purifier from a brand you trust. ( P) (P)The Plasmacluster 7000 Series KC850U Air Purifier with Humidifier by SHARP is your choice for medium sized rooms. Effective up to 1,230 sq. ft. at one air change per hour, the KC850U will filter the air in the AHAM Suggested Room Size of 254 sq. ft. at 4. 8 air changes per hour.( P)