Usage Tips:[EFFECTIVE FILTRATION]: HAPF600 filter replacement set contains 4 True HEPA filter, helps you absorb the suspended with microns effectively, the 4 included carbon filter's thick fits perfectly into the holding tabs on this "B" style HEPA filter. Combined use provide you higher filtration efficiency, longer use time, reduce unwanted odors in your living spaces, increased air quality enhances your indoor environment especially during this period of work at home. [PREMIUM QUALITY]: Fits for holmes air purifier filter replacement hapf600 is made of high-strength and non-woven fabric and pre-filter is full of activated carbon, adopt advanced lower energy consumption and well test by the manufacturer. Extend service life and save your money [PERIODIC REPLACEMENT]: 4 pack of HAP600 replacement filter available for your time replace. Size: hapf600 hepa filter 10.0 x 6.8 x 2.1Inch; pre-filter 9.2 x 5.9Inch. NOTE: Recommended to replace the filter every 3-6 months, extend the service life of the air purifier, it also depends on the environment air quality around you. [WIDELY COMPATIBILITY]: This highly efficient replacement filter is fully compatible with for holmes air purifier filters. Compatible Devices: HAPF600D-U3, HAPF600D-U2, HAPF600D-U1, Hapf600, HAP615, HAP625, HAP650, HAP675RC, HAP725, HAP750, HAP1625, HAP1650, HAP1725, HAP1750, BAP615, BAP625, BAP650, BAP1125, BAP1150, BAP 1175, BAP1225, BAP1250, BAP1300, 106633, 106643, 106653, 106569, 106853 Colour:As Shown Material:Plastic Package Contents: 4 * filter 4 * filter 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.