Routine maintenance of portable air filters should be conducted according to manufacturers' directions to assure the best possible efficiency and service life of the unit.

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Additionally, proper placement of portable air filtration units is essential. They should be placed near a specific pollutant source, when it is known, so that they are performing at the point where the contamination levels are highest.

The air inlet and outlet should not be blocked by walls, furniture or other obstructions.

For maximum effectiveness, all doors and windows of a room being treated by a portable air cleaner should be closed.

When central heating and cooling systems are present in the home, caution should be taken to ensure that air inlets and outlets are not blocked by furniture or other large objects which could impede circulation.

Consumers should become as informed as possible about air filtration systems, and should research their options thoroughly, keeping in mind that purification systems are not intended to be the primary solution to health problems related to indoor air quality and, if consumers choose to use them, they should be used along with appropriate source control, ventilation, and medical treatment.