Most Honeywell Air Purifiers have a “Filter Check/Reset” indicator that alerts you when it is time to change the filter. As a general rule:
Pre-filters should be replaced every 3 months.
HEPA filters should be changed every 12 months.
HEPA Clean filters (depending on the model) should be replaced either every 4 to 6 months. Please refer to the product owner’s manual for recommended replacement time frames.
Note: These replacement intervals are intended as guidelines only. Performance of any filter media is dependent upon the concentration of contaminants going through the system. High concentrations of contaminants such as dust, pet dander, and smoke will reduce the useful performance of the filters.
Note: the main filters on Air Genius or Quiet Clean Air Purifiers are permanent and do not need to be replaced but should be washed every 3 months according to the instructions in the owner’s manual.