The Honeywell Universal True HEPA Replacement Filter captures up to 99.97% of particles such as household dust， smoke， pollen， mold spores， and pet dander 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. Filters should be replaced every 1-5 years depending on use.

Replacement Filter F

Captures up to 99.97% of airborne particles at 0.3 microns

Package contains 1 filter

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-F1 filters are needed

For use with Honeywell Air Purifier Model Series: 11520， 12520， 13520， 17200， 18150， 17400， 50150， 50200， 50250， 50300

For air purifier models 12520， 17400 (or HEPA filter no. 22500) 2 HRF-F1 filters are needed

For air purifier models 13520，50250 (or HEPA filter no. 24000) 3 HRF-F1 filters are needed

For air purifier model 50200 (or HEPA filter no. 23500) 2 HRF-F1 filters are needed

For air purifier model 50300 (or HEPA filter no. 29500) 4 HRF-F1 filters are needed

Each HRF-F1 contains 1 HEPA filter and 1 gasket