Product Detail 250 CFM Rated for a 14Ê x 17Ê room 6 air changes per hour Multi-stage air purification system quietly outperforms competitive models Removes 99.97% of all particles as small as .1 microns including: smoke dust pollen and virtually all airborne allergens . The "Hunter Air Purifier Tower Model For 14' x 17' Room" is best product for you. We recommended Hunter Air Purifier Tower Model For 14' x 17' Room