The Honeywell Universal True HEPA Replacement Filter is 99.97% effective at capturing particles such as household dust, smoke, pollen, mold spores and cat dander*. The universal filter is designed to replace Honeywell True HEPA filter numbers 21500, 22500, 24000, 23500, and 29500.

• For use with Honeywell Air Purifier Model Series: 11520, 12520,13520,17200,18150,17400,50150,50200,50250,50300
• Filters should be replaced every 1-5 years depending on use
• For air purifier models 11520,17200,18150,50150 (or HEPA filter no. 21500) two HRF-14 filters are needed
• For air purifier models 12520, 17400 (or HEPA filter no. 22500) two HRF-14 filters are needed
• For air purifier models 13520,50250 (or HEPA filter no. 24000) three HRF-14 filters are needed
• For air purifier model 50200 (or HEPA filter no. 23500) two HRF-14 filters are needed
• For air purifier model 50300 (or HEPA filter no. 29500) four HRF-14 filters are needed
• Each HRF-14 contains 1 HEPA filter and 1 gasket

*from the air that passes through the filter. Overall particle reduction is dependent on many factors, including the amount of air processed, the pollutant type and the pollutants' introduction rate into the environment