Permanent filter-Under normal conditions of continuous use, filter should be cleaned every 6-12 months (approximately 4,320 hours), or more often depending on air quality and environmental factors Permanent Coconut carbon pre-filter-Coconut carbon pre-filter is a cleanable filter. Clean pre-filter every 3 months (with brush attachment on your vacuum, do not immerse filters in water.) Angled airflow output-Allows for use as a tabletop fan 4 fan speeds-Low for quiet operation, Medium for moderate cleaning speed, High for strong cleaning power, and Turbo for maximum cleaning power. Fan pulls air into the air purifier which passes through the pre-filter and filter Sleep mode-Air purifier operates on Low fan speed until manually changed. Accent light will shut off, only sleep mode light will remain on. Clean the air with confidence with LivePure's Capri Series Air Purifier. This air purifier is compact enough for a tabletop, but large enough to remove 99.9% of airborne particles as small as 0.3 microns including pollen, smoke, and dust with its powerful filtration. The coconut carbon pre-filter acts as the first layer of filtration to capture larger particles before reaching the filter. You'll appreciate its whisper-quiet operation on sleep mode, perfect for continued use while you rest, work, or unwind. Other features include a timer, Filter Cleaning Indicator, and accent light. The permanent cleanable filters can be vacuumed as needed. Bring home the Capri today and embark on a journey towards a more comfortable, cleaner living space.