Why not buy one of those electrostatic filters advertised on the radio by Paul Harvey or Rush Limbaugh, or that I can buy at a discount store?
These are passive electrostatic filters. Their fibers have a slight static charge. As airborne particles move through them, they can be attracted to the fibers, the way rubbing a balloon on a sweater will make it stick. They are a lot better than the $2 throwaway 1″ filters, but they can cause some problems in residential systems. As a passive electrostatic filter loads up with contaminants, its fibers become coated with particles and the “balloon effect” stops. This can happen quickly and then the filter is only effective against the larger particles in the air, over 5 microns. Further, in order for a passive electrostatic filter to work, it must be dense and therefore restrictive to airflow. In many homes this air can cause poor heating and cooling in the upper level of the home or in the rooms farthest from the air handling equipment. As the filter loads up, it becomes even more restrictive. This not only makes the air conditioning equipment work inefficiently, but can actually dama
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