Product details:

True HEPA filtration captures up to 99.97% of particles as small as 0.3 microns in size from the air including smoke, dust, pollen, pet dander, mold spores and dust mite debris. Recommended to replace once a year for maximum efficiency. This filter is approximately 6 1/2 x 10 1/4 x 1 1/2 inches. Package contains three filters.