This is a H13 TRUE HEPA replacement filter specially used for GCZ’s AP302 air purifier for Smoke Wildfire Activated Carbon   

• H13 True HEPA Filter: GCZ HEPA air purifier is equipped with a 4-stage filtration system including pre-filter, true H13 HEPA filter, activated carbon filter, non-woven fabric filter, captures particles as small as 0.3 microns, can reduces up to 99.97% of germs, dust, pollen, pet dander, mold, smoke, hair, and odor.
  

• Filter Replacement Eeminder: Our machines come with a 3000 hour filter change reminder. When the filter is used for 3000 hours, the indicator light will flash. Depending on air conditions, we recommend you replace the filter every 6-8 months