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