In some instances after a new air cleaner is installed, the statement is made, "We have more dust now than we ever had." So let's talk about white dust.
White dust actually can be described as "clean dirt". Where it is located, an examination will show the user that it is largely lint. It is most noticeable on dark furniture or window sills, and is usually found in homes containing new furnishings such as carpeting, drapes, etc., which give off more lint than such items that have been used and cleaned for some time. The amount of lint generated is increased by activity in the air; especially by children, pets, and heavy house traffic.
Visable lint particles, like cigarette ashes, are heavy as compared to the extremely small, individual dirt particles which make up cigarette smoke. Their weight causes the lint particles to "fall out" on furniture, floors, etc., just as cigarette ashes fall to the floor while cigarette smoke particles remain suspended in the air. Dirt particles, such as heavy pieces of lint or ash, which do not remain airborne, never reach the electronic air cleaner and the unit cannot remove these cannot remove these air particles. Fortunately, the black, greasy dirt particles with the damaging stain power are light in weight, remain in the air stream, and do reach the electronic air cleaner. It is their removal from the air that keeps the lint clean and therefore more visible.
There is no question that the electronic air cleaner is capable of collecting lint in addition to other atmospheric contaminants. This is easily confirmed by examining the air entering side of the ionizing-collecting cell before it is washed. You will note that along with the black greasy dirt collected, there are lint particles that did stay airborne long enough to reach the air cleaner.
Lint from new furnishings will decrease with wear. The length of time depends on the amount and type of fabric in the furnishings and the air circulation. In some areas, a bedroom for example, a lint condition may always remain.
Normally, continous fan operation (24 hours a day) will minimize this problem. If this cannot be accomplished, the controls should be set as near continous fan operation as possible. In some instances the use of a two speed fan motor is advantageous.
Cold air returns should not be restricted in any manner, particularly from rooms in which this lint is prevalent. If the returns in these rooms are blocked, the return air will seek another, longer path. In traveling a greater distance, lint fallout is increased. If rooms with higher evidence of "white dust" have no return air, it is recommended to add a return air vent, if possible.
Actually, the presence of large, clean lint particles is further proof that the air cleaner is doing its superior air cleaning job. Electronic air cleaners are dependent on the movement of air currents to bring the dirt particles to the unit for their removal. Weighty, non-airborne particles, such as ash, weigh too much to remain in the air currents while other particles, such as smoke, remain suspended and are carried to the electronic air cleaner for removal.