AllerAir HEPA filters should be replaced every three to five years. AllerAir carbon filters should be replaced every one to three years. Tar trapping pre-filters for DS models should be replaced every three to four months. Standard pre-filters should be replaced every two to three months; you may also vacuum them to extend use. AllerAir UV light bulbs should be replaced approximately every 10,000 hours. http://www.achooallergy.com/allerair-filters.asp
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