Guangzhou Olansi Water Treatment Equipments Co. Ltd is a professiona air purifier manufacturer producing negative ion air purifier ,active carbon air purifier,hepa air purifier,antibacterial air purifier and so on. air purifier How to buy best whole house hepa air purifier from best air purifiers reviews and buying guide ? Portable Air purifiers are growing in popularity, as pollution levels continue to rise around the world. There are a number of important factors you need to take into consideration when buying an air purifier to make sure you get the air quality that you expect and deserve. The first thing to look at with any air purifier you are thinking of buying is the CADR or clean air delivery rate. The CADR will decide the size of the space that the air purifier can be used in along with the speed in which the device removes toxins from the air, providing you with clean air at all times. As a rule of thumb, you will want to choose one for each...