Alen HEPA air filters should be replaced every six 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.

• Do not attempt to wash the Alen HEPA filters as it will damage the fibers.
• It is recommended to clean the pre-filter if it develops a layer of dust.
• Signs that your filter needs replacement include: motor will sound stressed or have an increased noise level due to dust build-up on the filter, an increase in dust levels on furniture.