| http://www.w3.org/ns/prov#value | - The charcoal removes all types of odors including pet odors, smoke and even perfumes while the electrostatic materials retain virtually all microscopic particles - items 1/200th the width of a strand of human hair.This filter is so well designed and manufactured that it only needs to be replaced after 50 hours of use, or approximately every 11-12 months depending on use.
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