Key things to look out for in an Air Purifier
One of the key points to consider in the operation of an Air Purifier is the CADR rate. CADR is an acronym for Clean Air Delivery Rate. In general, this numerical value will indicate the quantity of particles to be removed from the air. Basically, a CADR rating indicates how fast the air purifier can clean the air within a particular size room by cubic metre per hour (cm/h). For example, an air purifier with CADR rating of 300 cm/h will clean a room of 300 square metres much faster than an air purifier with CADR rating of only 200 cm/h.
A CADR measurement is usually evaluated for pollen, smoke, and dust. These three pollutants are not only small in size but also the most unwanted particles in the air. Smoke particles are ultra-fine particles, with the defined particle size ranges from 0.1 to 0.3 microns. Dust particles are common particles with size from 0.5 to 3 microns. Pollen particles are the large particles which can usually be seen with the naked eye, with size from 5 to 11 microns.