MEDICAL GRADE TRUE HEPA FILTER: The H13 medical grade True HEPA filters 99.97% of airborne pollutants, dust, pollen, and other allergens as small as 0.3 microns.
 
LONG LASTING AIR CLEANER FILTER: The true HEPA filter replacements can be used up to 3,000 hours (3-4 Months) of operation; an indicator light on the unit will let you know when it?s time to replace
 
SAFE AND RELIABLE: No matter what season it is, these Westinghouse air filters can catch dust mites, pollen, and other allergens so you can breathe easy
 
MODEL 1701 & 1903 REPLACEMENT: This air purifier HEPA filter is a replacement for the Westinghouse air purifier with NCCO technology models 1701 & 1903