GermGuardian FLT5000 HEPA GENUINE Replacement Filter C is a combination filter. It includes a HEPA filter that captures 99.97% of allergens as small as .3 microns. It also contains a pre-filter/activated carbon filter layer that captures odors from cooking, pets and smoking. It is recommended to use with the GermGuardian AC5000E, AC5250PT, AC5300B, AC5350W, AC5350B, CDAP5500; PureGuardian AP2800CA, Black+Decker Model BXAP250 and Lowe's Idlyis Model IAP-GG-125. The use of this genuine Guardian Technologies replacement part will maintain the product's performance.