High Performance: AirDoctor's 3-stage filtration system enhances air protection. Featuring an UltraHEPA filter and a dual-action Carbon VOC filter, the AirDoctor 2000 effectively captures allergens, pet dander, and harmful compounds like formaldehyde. ^^Captures particles 100 times smaller than the HEPA standardour UltraHEPA filter is independently tested to capture airborne particles as small as 0.003 microns. ^^AD2000 Room Coverage - Small and mighty purification engineered for smaller spaces, the AirDoctor 2000 provides powerful purification for small rooms, medium/small bedrooms, nurseries, home offices and more. It circulates the air in 305 sq. ft. 4x/hour or in 610 sq. ft. 2x/hour. CARB EO G-23-233^^AD1000 Room Coverage - Small and mighty purification engineered for smaller spaces, the AirDoctor 1000 provides powerful purification for small bedrooms, nurseries, home offices, laundry rooms and more. It circulates the air in 285 sq. ft. 4x/hour or in 570 sq. ft. 2x/hour. CARB EO G-19-032^^AirDoctor 2000 and 1000 are only compatible with UltraHEPA and Carbon VOC filters made by AirDoctor 1 set of filters are included for each purifier purchased.