True HEPA G Air Purifier Replacement Filters help capture 99.97 percent of airborne particles as small as 0.3 microns from passing through the filter. It is compatible with Honeywell HPA020, HPA030, HPA075, HPA080, HPA175 & HPA180 series air purifiers. For optimal performance, change out your HEPA filter annually to establish an unrivaled breathing experience.