This 3-stage filtration system, includes a carbon filer, VOC filter and pleated filter. Depending on the air quality in your environment, filters last up to 4 months

• 2 High-efficiency True HEPA filter +2 Activated Carbon Filter +4 Carbon Pre-filters
• Compatible with Lasko HF11200 Desktop Air Purifier, Part YY11200
• H13 True HEPA capture 99.97% of airborne dusts PM2.5 down to 0.3 microns in size. Remove large and airborne particles, including dust, common pollutants ,Activated carbon reduce Chemicals VOCs, tobacco smoke, PM2.5,common household bad smell
• Please replace regularly to keep your machine fresh and clean. For the best performance, clean the filter once a month with a soft brush gently or with a vacuum cleaner.
• Top-Notch Quality Used for Maximum Customer Satisfaction Guaranteed. Change the PUREBURG replacement filter in a minute, no tools required. Note: please remove the new filter from the plastic bag before placing it into the machine..