The reason for this is that approximately 95% of airborne dirt is composed of particles too small to be caught in the mesh of an ordinary filter. Only the large particles are stopped while the smaller ones pass right through. These smaller particles are the ones that stain and dull the interior of your facility. A Terng Woei air Precipitator, however, is non-selective as to particle size and will stop particles as small as 0.01 micron. A Terng Woei does not strain the dirt from the air, but attracts and holds it like a magnet. Polluted air has long been recognized as a detriment to well being. The extent to which it is harmful is still not known, but ever-increasing research strongly points to polluted air as a contributing factor to many illnesses-particularly diseases of the respiratory and circulatory systems. Thousands of people suffering from airborne allergies and asthma have experienced immediate relief upon the installation of air precipitators. A Terng Woei air Precipitator will not cure an allergy, but it can eliminate the wheezing, and sneezing that accompany an allergy. Also, the more times a person.