The electrostatic air filters manufactured by Dust Free utilize synthetic material which develops an electrostatic charge as friction is applied to the plastic fibers. In the filters case, air flowing through the filter provides the necessary friction. This can be demonstrated by rubbing the surface of the filter with a cloth briskly and placing the filter over light weight flakes of material such as tea leaves, or styrofoam chips. The small chips will be attracted to the filter surface and held there due to the charge that developed on the filter as a result of rubbing it. The electrostatic charge that is developed as air passes through the filter, increases the filters attraction to particles such as pollen, molds, and dust.

The filter will work as long as it is clean and air is passing through it. If you would like to see what your filter is catching, wash your filter in a sink or tub which allows the water to be held. By placing this water in a glass, you will be able to see that particles which had been trapped by the filter. Some particles are very light in color and will not be visible on the face of the filter but will be seen in the water used in cleaning.

IMPORTANT: Your filter should be cleaned regularly to maintain maximum air flow in the system.