The Honeywell A Pre-Filter helps reduce household odors and captures larger airborne particles all while helping to extend the life of your HEPA filter. This Genuine Honeywell Pre-Filter is designed exclusively to be cut- to size to fit Honeywell Air Purifier models in the HPA100/200/300 series, HPA020 & HPA030 series, HPA075/HPA080 & HPA175/180 Series, HPA3000 series,HPA5000, HPA830, 50250 and 17000 series. For best performance, use only Genuine Honeywell air purifier filters, and replace every 3 months.