Hunter Air Purifier 200 CFM (for 14'x14' room) Model 30055 - 200 CFM output changes air 10 times an hour in a 12Ê x 12Ê room 3-speed fan Easy Change filter * Model 30065 - 200 CFM output changes air 7 times an hour in a 14Ê x 14Ê room 3-speed fan ionizer with separate switch Easy Change filter * Model 30075 - 225 CFM output changes air 7 times an hour in a 14Ê x 16Ê room 3-speed fan ionizer with separate switch Easy Change filter with Change Indicator Chart *