To get the best air purifier for yourself is no mean task as there are a variety of them and the technology behind them is also different. The job of an air purifier is to clean the air of all its pollutants and that would include allergens, particulates, gases, etc. following is a comparison between the three main kinds of air purifiers that are ruling the roost in the purifier market. The most advanced of all the air purifiers is definitely the HEPA air purifier. A HEPA purifier is basically a polymer sheet with minute holes through which air can pass, but very little else can.
In fact the holes are so small that we need a pretty large surface area for a reasonable amount of airflow. That is why most HEPA filters are arranged in the fashion of an accordion to provide maximum surface area in a limited space. Some HEPA filters have larger pores to allow more airflow but they are supplemented by a further filter.
There are electrostatic wands which captures the smaller particles that get through the larger holes. HEPA purifiers are however more expensive than other purifiers and they have to be changed from time to time. The period might vary from anything between 6 months and 5 years depending upon the manufacturer.
There is also the problem of the noise produced by the motor that propels the fan inside a HEPA purifier. A newer variety of air purifier is the ultraviolet air purifier. These use UV light to alter the DNA profile of microorganisms like bacteria and viruses. Most viruses and a few bacteria are smaller than .3 microns and so would pass through the best of HEP filters.
The problem with UV air purifiers is that they are ineffective against particulates and gases. Ion generating air purifiers are the third variety. The way these purifiers work is that they emit a stream of negatively charged ions. These ions in turn charge the particulates in the air. So when they come in contact with anything they just stick there.
The problem with these purifiers is that the particulates stick to the walls altering the look of the room. Generally it is found that the wall around the unit is completely black. And since there is no fan the cleansing occurs only near the purifier. The choice is difficult, but with more information and better knowledge you can take a prudent decision.
Jason Uvios writes about on Getting the Best Air Purifier to visit :- air purifiers, air ozonator systems and air cleaners