Below is a list of Air Filtration Systems manufacturers from. Air filtration systems describe a wide variety of equipment used to remove impurities from the air with a number of different filtration and purification schemes. Air filters cleanse, purify and reduce the overall number of particulates and other impurities present in an air source. As all filtering systems can be designated as either air or liquid filters, this particular category encompasses an extremely broad and diverse range of pollution control equipment. The specific use or application will help to determine the degree of purification necessary.