Aftermarket Honeywell Filter R True HEPA Replacement Filter - 3 Pack, HRF-R3 By Breathe Naturally&reg; Aftermarket Filter R True HEPA Replacement Filter 3-Pack Compare to OEM Part # HRF-R3 Made by Breathe Naturally Fits Models: HPA-090 Series, HPA-100 Series, HPA200 Series & HPA300 Series For best performance replace once per year or as needed depending on your specific conditions Captures up to 99.97% of airborne particles at .3 microns & larger For Best results use with Aftermarket Honeywell Carbon filter HRF-Ap1 By Breathe Naturally Made in the USA from Premium BulkFilter Brand Activated Carbon Filter Media