Product Features: Room Size: up to 50m2 One Button Activation High Quality Steel Mesh Filter Change Indicator On/Off Timer: No Speed 1-2-3-Off Dimensions: Height 522mm Width 330mm Depth 330mm Weight 7 kg Air flow rate 230 – 620 m3/h (135 – 365 cfm) Air exchange** 5 per hour (50 m2 or 540 sq.ft.room) Power consumption**** 30 – 61 W Level of noise level 31 – 56 dB(A) Average filter change six months*** Blue is available in different colors for the Pure 221 air purifier. The colored fabric serves as a pre-filter. Certified ratings as stated are based on US models (120VAC, 60Hz) with Blue particulate filter. The ranking may affect the use of other Blue filters. Hourly air changes are calculated on the recommended room size, assuming 8-foot (2.4-m) ceilings. For smaller rooms, air changes per hour will increase. Depending on the air quality in the area where it is used, the recommended six monthly filter change may be longer. The electrical voltage and frequency affect the power consumption of the device. Therefore the energy consumption may differ from the above value. 360 Degrees Air supply from all sides ie 360 degrees means that Blue Pure is fully effective wherever you place the Particle + Carbon Filter Removes airborne particles such as pollen, dust and pet dander. Activated carbon is also effective against smoke, odors, gases and volatile organic compounds (VOCs). General care Take good care of your Pure 411 to ensure good performance. • Vacuum the pre-filter occasionally to remove dust or wash it at a low temperature in the washing machine. • Change the main filter every six months, depending on the conditions of use. Always switch off the device before changing the main filter. • When opening the device to change the filter, vacuum the dust that has collected inside the device. • Occasionally wipe the top of the device with a dry dust cloth.