http://www.sharpusa.com/ForHome/HomeEnvironment/AirPurifier/Models/KC850U.aspx?tech_specs=1
Filters
Clean Filter Indicator Light: Yes (Replace when indicator is on)
Micro Mesh Pre-Filter: Back Panel
Deodorizing
Filter Type: Washable Active Carbon
Filter Life: up to 5 years after opening
Humidification
Filter Type: Humidifying filter
Filter Life: up to 2 years after opening