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Alen HEPA air filters should be replaced every 6 months to achieve maximum air filtration. With regular Alen air filter replacements, you extend the life of your air purifier, meet Alen's Lifetime Warranty Policy and ensure optimal air particle removal. Keep your family safe and healthy with regular air filter maintenance. Do not attempt to wash the Alen HEPA filters as it will damage the fibers and void your units' warranty. Signs that your filter needs replacement include: bad odor or smell from the unit, increased signs of dust on furniture or increased sneezing or coughing due to allergies.