How often should I replace the filters?

The Certified HEPA filters should be replaced every 12 months and the Odor Reducing Pre-filter should be replaced every 3 months, especially if there have been heavy odors and particles in the home. However, these are guidelines only and filters should be checked periodically as individual home conditions may vary, and high concentrations of contaminants such as dust, pet dander, and smoking will reduce the useful performance of the filter.