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 to 5 years depending on use.

Replacement Filter D (replaces HRF-11)

Captures up to 99.97% of airborne particles at 0.3 microns

Package includes 1 filter， which should be replaced every 3 to 5 years

For air purifier model 10500 (or HEPA filter no. 20500) 2 HRF-D1 filters are needed

For air purifier model 17000 (or HEPA filter no. 20500) 2 HRF-D1 filters are needed

For air purifier model 17005 (or HEPA filter no. 20500) 2 HRF-D1 filters are needed

For air purifier model 17352 (or HEPA filter no. 83154) 2 HRF-D1 filters are needed