[Easy to replace] Installation is easy; no tools required. Simply remove and replace from your unit when For best performance please replace the old filter . [Effect] Dual action HEPA-Type air filters with built-in carbon pre-filter capture up to 99.97% of particles down to 0.3 Micrometre in size. Get effective HEPA carbon replacement filter pack from us. You'll notice the difference immediately in the air of your home. [Warm Tips] Replace your HEPA Filter Every 2-3 months, replace pre filter 1-2 month. The Time of Replace Filter, is According to your Requirement. [Compatibility Model] Compatible with for U Filter HHT270,HHT270W, HHT290 Series & Models FRF101B FHT170W FHT180W FHT190W FRF102B FHT170WCV FHT180X FHT180, FHT190V. [Practicality] This high-efficiency two-stage True HEPA filtration is perfect for those with frequent or recurring allergies as it effectively with most pollen, mold spores, household dust, pet dander and smoke, so the air you breathe is free from irritants.And helps redue unwanted odors from pets, cooking, smoking, wildfire, and harmful VOC's.