[Perfect Compatibility] A DOCTOR 3000 Replacement Filters Set Compatible with A DOCTOR 4-in-1 Home Air Purifier Filters. Compare to Part No. ADF3001 ADF3002. NOT FIT FOR 3500 MODEL ! [Cost-Effective Price] (1+2+4 pack) A DOCTOR 3000 Replacement Filters set contains 1 H13 TRUE HEPA + 2 activated carbn filters + 4 pre-filters, 7 units value pack save much cost for your all year round air cleaning need. [Premium H13 true HEPA] 3 filtration effectively improve the air quality for your home. Environmentally friendly and healthy materials are suitable for families with pets. Higher level filtration performance for long time using. [Change Regularly] It is recommended to replace the 3000 H13 HEPA for every 10 - 12 months, replace the 3000 Activated Carbon for every 4 - 6 months, replace the 30000 pre- filters for every 2 - 3 months depending on the air quality and usage frequency. Compatible with A . 3000 4-in-1 Home Air Purifier Part No.: ADF3001 ADF3002 Colour: white + black Material: plastic Package Contents: 1* filter 2*Black filter 4*black cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.