A:Answer The filters are typically estimated to last about 6 months, with the lifespan dependent on the current air quality as well as how often the unit is run. You may or may not see buildup on the filters themselves. In some cases, they may look very grey or dusty—in others, the particles may be microscopic and not visible to the naked eye. Either way, it is encouraged to change the filters after about 6 months of use or at your own discretion.
