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If there are heavy concentrations of odors, smoke, or large particles in the home, you may need to change the activated carbon pre-filter more often. We DO NOT recommend operating the air cleaner without the activated carbon pre-filter. The HEPA filter may become contaminated and begin to emit any odors captured. CAUTION: Do not attempt to wash either the activated carbon pre-filter or the HEPA filter. They are not washable and washing will damage the filters. How to Change the Filters... CAUTIO