[Compatible Models]This A231 Replacement Filter compatible with for A231/ A230 air purifier, compared to part # 1712-0110-00, please check your machine before order [3-Stage Air Purification System]1712-0110-00 Replacement Filter combine with Fine Mesh Pre-Filter, HEPA filter and High-Efficiency Activated Carbon Filter, perfect fits for A231/ A230 air cleaner to attach airborne particles found indoors, provide a fresh and clean environment [ Premium HEPA Technology]Attach 99.97% of airborne particles including dust, pollen and pet dander and more particles as small as 0.3 microns in size, comes with a built-in pre-filter which capable of attach the airborne particles at the beginning [Activated Carbon Filter]Full of activated carbon content for excellent odor filtration, absorb household odors from cooking, smoke and pets odors, maxium prolong the HEPA Filter lifespans [Exquisite Craftsmanship]Our 1712-0110-00 replacement filter advanced with lower energy consumption and lower density structure technology for higher efficiency and less pressure to maximum filtration. This A231/A230 air filter feature with energy saving and excellent performance Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Color: As Shown Material: HEPA composite materials Package Contents: 2 * Replacement Filter 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.