TRUE PERFECT COMPATIBILITY WITH AD3000 & AD3500: 1 Genuine AirDoctor Pre-Filter replacement, the only filter that is truly compatible with the AirDoctor AD3000 and AD3500 unit | UPDATED FILTER DESIGN: Our thoughtfully designed new filter eliminates guesswork and simplifies the installation process with a foolproof alignment, with only one way to fit the filters in the unit. | FILTRATION: Designed to capture larger contaminants like dust & animal hair. | COST EFFICIENT: Save money in the long run with genuine AirDoctor filters, as they are the only ones guaranteed to work with your AD3000 and AD3500. Additionally, after-market filters voids your warranty.

&q;:&q;Genuine AirDoctor 3000 and 3500 Universal Pre-Filter Replacement Filters are designed to fit both the AirDoctor AD3000 and AD35000 units. Designed to capture larger airborne contaminantst, it is step one of a powerful air cleaner that captures particles at 0.003 microns, which is 100 times smaller than the HEPA standard thus much more powerful than most other premium HEPA filters! With the AirDoctor we provide professional UltraHEPA filtration whether you are looking for home air purifiers that are superb for offices classrooms hospitals, etc. Before replacing the UltraHEPA or carbon/gas trap/VOC filter of your AirDoctor air purifier, turn off and unplug the unit from the electrical outlet and read all safety instructions and important warnings in this owners manual. Customers who purchased this item also purchased: AirDoctor 3500, AD3500, AD 3500, AirDoctor AD 3500, AirDoctor 5500, AirDoctor AD 5500, AirDoctor 2000, AirDoctor AD2000, AirDoctor 1000PROP 65 WARNING: This product can expose you to some kind of chemical, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.&q;,&q;