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furnace air filters Air cleaners use a variety of filtering technologies to remove airborne contaminants and odors from the air.
  • HEPA filters, or High Efficiency Particulate Air filters, are designed to remove 99.97% of all airborne particles 0.3 microns or larger from the air that passes through the filter.
  • ULPA filters, or Ultra-Low Penetration Air filters, are designed to remove 99.999% of all 0.3 micron airborne particles from the air that passes through the filter.
  • Electrostatic filters have a static charge on the filter to allow airborne particles to "stick" to the filter, just as static-charged clothing sticks together.
  • Electrostatic precipitators create opposite charges on the metal wires or plates in a precipitator assembly.  They attract airborne particles to the plate or grid wire that contains an opposite charge.  The assembly can be washed and reused.
  • Ionizers emit a small charge into the air stream, which causes particles to adhere to the filter or other surfaces by a magnetic-like attraction.  This charge causes the particles to stick together, making them larger.  These larger airborne particles are easier to capture as they pass through the filter.
  • Ozone air cleaners introduce small quantities of ozone into the air to reduce airborne pollutants.
  • Carbon filters capture large airborne particles and help reduce unpleasant odors.  They should be replaced every 3 to 6 months, depending on usage.
  • Washable foam filters help capture large airborne particles.  Foam air filters should be periodically removed from the air cleaner, washed in warm, soapy water, then rinsed, drip-dried thoroughly, and re-installed in the air cleaner.

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Air Filters - Air Filter Technologies and Terminologies