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.