Philips Air Purifier AC0650 for Rooms up to 44 m² Particle filtration efficiency for nano-sized particles smaller than 0.003 microns* Cleans air in rooms up to 44 m², with a maximum power consumption of 12 W, and a clean air delivery rate (CADR) Customizable speed modes with 3 levels: Medium, Turbo, and Sleep 2-layer filtration system using NanoProtect HEPA technology, effectively capturing fine particles as small as 0.003 microns at 99.97% efficiency (1) Recommended filter replacement: every 12 months