Mechanical and Electrostatic Air Filters remove contaminants such as bacteria, fungi, dust and many more airborne infectious agents, from the air through different forms of filtration.
Camfil provides excellent information on the principles of filtration, click here to learn more about the various mechanisms of air filtration.
Here is a great article with tons of facts about Electrostatic Filtration!
Also, click here to read a little more about ASHRAE Filter Rating Standards.
And finally, click here to learn a little more about MERV Ratings!