We recommend that you choose an air purifier to consider the following main air flow: good air purifier ventilation speed must be fast, that wind capacity in the product specification to (m3 / h) to represent, the better the value. Purification efficiency: choose clean and efficient products, specifically to see the removal of the solid particles, the removal of volatile organic compounds, formaldehyde removal, these three indicators are usually expressed as a percentage, the better the value. Filter: the mainstream air purifier filters for each layer for different pollutants, such as: pre-filter can absorb small dust particles and hair; deodorizing filter multi-finger activated carbon filter can remove sweat smell, pet odors such as smell; formaldehyde removal filter is designed for formaldehyde; HEPA dust filter is used to remove dust mites, pollen, bacteria, secondhand smoke, dust and other tiny particles requires special attention is filter replacement frequency and filter cost, how long to replace one, in fact, according to the frequency and extent of the contamination. Noise: As long as no more than 30 db, would not affect sleep at night in the bedroom, then choose a mute function or sleep mode products. Non-silent mode noise'll sleep under the influence Application area: Each air purifiers are marked Approximate area. It can be used as an optional reference. It is noteworthy also taking into account storey house, if the size of the standard height of more than 2.8 meters, then you should take into account this factor, buy a larger area of ??suitable products. Security: look for 3C certification, buy the regular manufacturers. A perfect after-sales service of the product manufacturers. The latest generation of electrostatic glass fiber filter, can capture smaller particles than the cell. Granular activated carbon filters use porous walnut shell and through the development of modern bio-carbon composite technology, this machine can be activated carbon adsorption area of ??up to 750000m2. Innovation and application of air quality of human technology to automatically detect the built-in odor sensor, automatic detection of the sources of pollution in the air, and automatically control the operating state of the machine. Air purification degree indication at startup sensor function, purification of the indicator by color change, it can display the status of the current ambient air quality. Automatic alarm set electrostatic precipitator, activated carbon + HEPA filter replacement warning lights. Automatic mode built-in smart chip, can be set to "manual, automatic, time, sensor" mode as needed. Automatic power-off the machine set up automatic power safety switch, simply open the front panel of the machine will automatically power down. LED color display uses LED color display, easier to use. Ultra-quiet motor PG-leading ultra quiet technology for cleaner power system technology upgrade has opened a new page. First layer: electrostatic precipitator filtration can filter smaller than the cells of dust, smoke and bacteria, prevent lung disease, lung cancer and liver cancer and other diseases. The air is the most harmful to human dust less than 2.5 microns, which is likely to penetrate cells and into the bloodstream.