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Permanent furnace metal filters are convenient and often economical. It's quite likely your permanent metal filter is slightly more efficient than the disposable ones, but it has nowhere near the efficiency of the HEPA metal filters they use in hospitals and bars where smoking is allowed. The most important aspect of permanent metal filters is that they must be cleaned in order to perform properly or they won't be efficient or economical

Read the directions to find out what type of permanent metal filter you have. Find out whether you've got the type with a pleated metal filter or one with polyester or metal insides. The ones with the pleated insides are either refillable or permanent. The metal filters with metal grills and polyester or metal insides are generally cleanable. Whatever type metal filter you have, it must be kept clean for the furnace and air conditioner to work efficiently. A metal filter that is too clogged with dirt can actually damage the fan motor on the furnace because the dirt-thickened metal filter causes the motor to strain as it pulls air in.

High-efficiency metal filters can remove as much as 90 percent of common household airborne debris and need special cleaning. If you have questions about a permanent metal filter that you've inherited from a previous owner, visit your local hardware or home store or call the heating specialist who installs or services your furnace. They generally leave a sticker on units whenever they service them. One of these people will know what kind of cleaning is recommended for your metal filter.

Vacuum polyester and electronic permanent metal filters to remove dust. If you're fortunate enough to have an attachment for pleated blinds, these fit perfectly in pleated metal filters. Use the small brush attachment for metal parts on electronic metal filters. Vacuuming these metal filters helps fabric parts keep their shape and keeps electronic parts dry. Clean these metal filters every month or two during heavy-use heating or cooling seasons and no less frequently than every three months otherwise.

Wash metal screens and parts of non-electric electrostatic or metal-weave metal filters with a sink sprayer or garden hose. Use a mild solution of dishwashing detergent and soft brush if the dust is dirty or greasy, such as what might occur when a metal filter is near a kitchen or workshop. Let the metal filter air-dry completely before replacing in the furnace sleeve. If there are "nooks and crannies," use a hair dryer to get them dry because some metal filters do not use rust-resistant metals or coat-soldered joints. Clean these metal filters every month during high-usage periods and every two months at most.

Clean blade-type electrostatic metal filters with a soft, lint-free cloth. Dampen the cloth with vinegar to soften greasy dirt but never soak a blade that's part of a metal filter that uses electricity. Never spray these metal filters or their housing with household cleaners--that can damage surfaces and the spray can carry water into electronics. Clean these blades once or twice a month, depending on the size of the metal filter.

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